#include&lt;stdio.h&gt;   #include&lt;sys/types.h&gt;   #include&lt;sys/un.h&gt;   #include&lt;sys/socket.h&gt;&nbsp;   int main&#40;&#41;   &#123;       struct sockaddr_un add_server;       int fd_server;       fd_server = socket&#40;AF_UNIX,SOCK_STREAM,0&#41;;       if&#40;fd_server == -1&#41;           perror&#40;&quot;socket&quot;&#41;;       add_server.sun_family = AF_UNIX;       strcpy&#40;add_server.sun_path,&quot;server_sock2&quot;&#41;;       if&#40; bind&#40;fd_server,&#40;struct sockaddr*&#41;&amp;add_server,sizeof&#40;add_server&#41;&#41; != 0&#41;           perror&#40;&quot;bind&quot;&#41;;       if&#40; listen&#40;fd_server,3&#41; != 0&#41;           perror&#40;&quot;listen&quot;&#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/un.h&gt;   #include&lt;sys/socket.h&gt;&nbsp;   int main&#40;&#41;   &#123;       struct sockaddr_un add_server;       int fd_server;       fd_server = socket&#40;AF_UNIX,SOCK_STREAM,0&#41;;       if&#40;fd_server == -1&#41;           perror&#40;&quot;socket&quot;&#41;;       add_server.sun_family = AF_UNIX;       strcpy&#40;add_server.sun_path,&quot;server_sock2&quot;&#41;;       if&#40; bind&#40;fd_server,&#40;struct sockaddr*&#41;&amp;add_server,sizeof&#40;add_server&#41;&#41; != 0&#41;           perror&#40;&quot;bind&quot;&#41;;       if&#40; listen&#40;fd_server,3&#41; != 0&#41;           perror&#40;&quot;listen&quot;&#41;;       return 0;   &#125;
A. 0 B. 1 C. 2 D. 3
Explanation:The second argument of listen() specifies the length for the queue for pending connections.