C programming

What does this function do when called? (Please answer using paper and pencil/pen only) void foo(char *s, char *t) { while (*) S++; while (*S++ *t++) } Always throws an error O Changes characters in string t to the next character in the string s O Copies a string at address t to the string at address s O Appends the string at address t to the end of the string at address s If num is a variable of type int and temp is a variable of type double, how could you correctly complete this function call? scanf("%lf%d", .); O num, temp &num, &temp temp, num O &temp, &num O none of the above