Consider the following function written in the C programming

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Consider the following function written in the C programming languages.
void foo(char *a)
{
   if(*a && *a != ‘ ’)
   {
   foo(a+1);
   putchar(*a);
   }
}
The output of the above function on input "ABCD EFGH" is

1. ABCD EFGH
2. ABCD
3. HGFE DCBA
4. DCBA

Correct Option: D

if condition fails & returns controls
∴ DCBA will be pointed