<p>Why not use <code>ns_t_opt</code> as is?<br>
<a href="https://github.com/c-ares/c-ares/blob/master/test/dns-proto.h#L181">Example</a></p>
<p>And replace T_A, T_AAAA and other macros to similar from <code>arpa/nameser.h</code>.</p>

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