#include &lt;iostream&gt;    #include &lt;ios&gt;    #include &lt;istream&gt;    #include &lt;limits&gt;    using namespace std;    template &lt;typename CharT&gt;    void ignore_line &#40; basic_istream&lt;CharT&gt;&amp; in &#41;    &#123;        in.ignore &#40; numeric_limits&lt;streamsize&gt; :: max&#40;&#41;, in.widen &#40; '\n' &#41; &#41;;    &#125;    int main&#40;&#41;    &#123;        cout &lt;&lt; &quot;First input: &quot;;        cin.get&#40;&#41;;        cout &lt;&lt; &quot;Clearing cin.\n&quot;;        cin.clear&#40;&#41;;        ignore_line &#40; cin &#41;;        cout &lt;&lt; &quot;All done.\n&quot;;    &#125;
A. First input
B. Clearing cin
C. Error
D. None of the mentioned
Answer:A
#include &lt;iostream&gt;    #include &lt;ios&gt;    #include &lt;istream&gt;    #include &lt;limits&gt;    using namespace std;    template &lt;typename CharT&gt;    void ignore_line &#40; basic_istream&lt;CharT&gt;&amp; in &#41;    &#123;        in.ignore &#40; numeric_limits&lt;streamsize&gt; :: max&#40;&#41;, in.widen &#40; '\n' &#41; &#41;;    &#125;    int main&#40;&#41;    &#123;        cout &lt;&lt; &quot;First input: &quot;;        cin.get&#40;&#41;;        cout &lt;&lt; &quot;Clearing cin.\n&quot;;        cin.clear&#40;&#41;;        ignore_line &#40; cin &#41;;        cout &lt;&lt; &quot;All done.\n&quot;;    &#125;
A. First input B. Clearing cin C. Error D. None of the mentioned
Explanation:In this program, We are getting the input and clearing all the values.