#include&lt;stdio.h&gt;   #include&lt;sys/types.h&gt;   #include&lt;sys/socket.h&gt;&nbsp;   int main&#40;&#41;   &#123;       int fd;       fd = socket&#40;AF_UNIX,SOCK_STREAM,0&#41;;       printf&#40;&quot;%d\n&quot;,fd&#41;;       return 0;   &#125;
A. 0
B. 1
C. 2
D. 3
Answer:A
#include&lt;stdio.h&gt;   #include&lt;sys/types.h&gt;   #include&lt;sys/socket.h&gt;&nbsp;   int main&#40;&#41;   &#123;       int fd;       fd = socket&#40;AF_UNIX,SOCK_STREAM,0&#41;;       printf&#40;&quot;%d\n&quot;,fd&#41;;       return 0;   &#125;
A. 0 B. 1 C. 2 D. 3
Explanation:The socket() returns the lowest available file descriptor and in this program i.e. 3.