Question: 4. This program is valid for<div class="hk1_style-wrap4"><div class="hk1_style-wrap3"><div class="hk1_style-wrap2"><div class="hk1_style-wrap"><div class="hk1_style"><div class="c"><ol><li class="li1"><pre class="de1"> <span class="co2">#include&lt;stdio.h&gt;</span></pre></li><li class="li1"><pre class="de1"> <span class="co2">#include&lt;netinet/in.h&gt;</span></pre></li><li class="li1"><pre class="de1"> <span class="co2">#include&lt;sys/types.h&gt;</span></pre></li><li class="li1"><pre class="de1"> <span class="co2">#include&lt;sys/socket.h&gt;</span></pre></li><li class="li1"><pre class="de1">&nbsp;</pre></li><li class="li1"><pre class="de1"> <span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span></pre></li><li class="li1"><pre class="de1"> <span class="br0">{</span></pre></li><li class="li1"><pre class="de1"> <span class="kw4">int</span> fd_client<span class="sy0">,</span>fd<span class="sy0">,</span> len<span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> <span class="kw4">struct</span> sockaddr_in add_server<span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> fd_client <span class="sy0">=</span> socket<span class="br0">(</span>AF_INET<span class="sy0">,</span>SOCK_STREAM<span class="sy0">,</span><span class="nu0">0</span><span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> <span class="kw1">if</span> <span class="br0">(</span>fd_client <span class="sy0">==</span> <span class="sy0">-</span><span class="nu0">1</span><span class="br0">)</span></pre></li><li class="li1"><pre class="de1"> <span class="br0">{</span></pre></li><li class="li1"><pre class="de1"> <span class="kw3">perror</span><span class="br0">(</span><span class="st0">"fd_sock"</span><span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> <span class="kw3">exit</span><span class="br0">(</span><span class="nu0">1</span><span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> <span class="br0">}</span></pre></li><li class="li1"><pre class="de1"> add_server.<span class="me1">sin_family</span> <span class="sy0">=</span> AF_INET<span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> add_server.<span class="me1">sin_port</span> <span class="sy0">=</span> ntohs<span class="br0">(</span><span class="nu0">4001</span><span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> add_server.<span class="me1">sin_addr</span>.<span class="me1">s_addr</span> <span class="sy0">=</span> inet_addr<span class="br0">(</span><span class="st0">"144.29.8.2"</span><span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> len <span class="sy0">=</span> <span class="kw4">sizeof</span><span class="br0">(</span>add_server<span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> fd <span class="sy0">=</span> connect<span class="br0">(</span>fd_client<span class="sy0">,</span><span class="br0">(</span><span class="kw4">struct</span> sockaddr<span class="sy0">*</span><span class="br0">)</span><span class="sy0">&amp;</span>add_server<span class="sy0">,</span>len<span class="br0">)</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> <span class="kw1">return</span> <span class="nu0">0</span><span class="sy0">;</span></pre></li><li class="li1"><pre class="de1"> <span class="br0">}</span></pre></li></ol></div></div></div></div></div></div>
Options:
IPv4
IPv6
both IPv4 and IPv6
none of the mentioned
Answer: A