#include&lt;stdio.h&gt;   #include&lt;unistd.h&gt;&nbsp;   int main&#40;&#41;   &#123;       pid_t child;       child = fork&#40;&#41;;       printf&#40;&quot;%d\n&quot;,child&#41;;       return 0;   &#125;
A. it will print “0”
B. it will print the PID of the child process
C. both (a) and (b)
D. none of the mentioned
Answer:A
#include&lt;stdio.h&gt;   #include&lt;unistd.h&gt;&nbsp;   int main&#40;&#41;   &#123;       pid_t child;       child = fork&#40;&#41;;       printf&#40;&quot;%d\n&quot;,child&#41;;       return 0;   &#125;
A. it will print “0” B. it will print the PID of the child process C. both (a) and (b) D. none of the mentioned
Explanation:The “fork” system call returns the PID of the child process when it is executed by the parent process and returns 0 when it is executed by the child process.