Consider the following code.

char *findSubstring(char *str, char *needle) { int len = strlen(needle); int n = 0; while (*str) { printf("%c%c ",*str, *needle); if ( *(needle+n) == *str) { n++; if (n == len) return (str-len)+1; } else { str -= n; n = 0; } str++; } return NULL; }

What is the output of findSubstring("ABCDE","CD")?

Group of answer choices

AC BC CC DD

AC BC CC DC

AC BC CC DC EC

AC BC CC DC ED

AC BC CC