Array indexing error?

Two students A and B were given an assignment to write a C code in which an int array a of 5 elements is declared/initialized with {1,2,3,4,5} at compile-time and the 2nd element (0-indexing) of a is printed in output (stdout).

Given below are the code snippets written by A and B respectively.

Code by A:

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#include<stdio.h>
int main() {
    int a[5]={1,2,3,4,5};
    printf("%d",2[a]);
    return 0;
}

Code by B:

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2
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5
6

#include<stdio.h>
int main() {
    int a[5]={1,2,3,4,5};
    printf("%d",a[2]);
    return 0;
}

Which of the two code snippets are correct (they give the desired output without any errors) ?