#include&lt;stdio.h&gt;&nbsp;    int main&#40;&#41;    &#123;        int ret_val;        int fd&#91;2&#93;;        ret_val = pipe&#40;fd&#41;;        printf&#40;&quot;%d\n&quot;,ret_val&#41;;        return 0;    &#125;
A. 0
B. -1
C. 1
D. none of the mentioned
Answer:A
#include&lt;stdio.h&gt;&nbsp;    int main&#40;&#41;    &#123;        int ret_val;        int fd&#91;2&#93;;        ret_val = pipe&#40;fd&#41;;        printf&#40;&quot;%d\n&quot;,ret_val&#41;;        return 0;    &#125;
A. 0 B. -1 C. 1 D. none of the mentioned
Explanation:The “pipe” system call returns 0 on the successfull creation of the pipe.