string and constant charaters

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Summary
The bast way to declare string is the "character array"
char is_a_string[] = "abc";
char is_a_string[10] = "abc";

This is a constant char array.
char* is_a_const = "abc"
True or False
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#include <stdio.h>
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#include <string.h>
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​
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​
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int main() {
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​
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    //A) F
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    //The string "char* pc1" is a read-only literal (formally its type is const char[4]).
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    // -->char pc1[5] = "john";
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    // It's a CONST !!! You can't use char* to change constant.
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    char* pc1 = "john";
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    *pc1 = 'J';
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​
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    //B) T
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    char pc2[] = "john";
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    *pc2 = 'J';
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​
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    //C) F
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    //may use "restrict"
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    //"Hello, " is a "const char[]"，but a "char array"
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    // It's a CONST !!! You can't use char* to change constant.
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    char* str1 = "Hello, ";
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    char* str2 = "world! ";
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    strcat(str1, str2);
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​
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    //D) F
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    // char* pc3; --> error: ‘pc3’ is used uninitialized in this function
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    // Even if initialized pc3, It's a CONST, too !!!
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    // You can't use char* to change constant.
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    char* pc3;
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    *pc3 = 'a';
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​
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    return 0;
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}
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Summary

True or False