&lt;?php$age = array&#40;&quot;Harry&quot; =&gt; &quot;21&quot;, &quot;Ron&quot; =&gt; &quot;23&quot;,&quot;Malfoy&quot; =&gt; &quot;21&quot;&#41;;array_change_key_case&#40;$age, CASE_UPPER&#41;;array_pop&#40;$age&#41;;print_r&#40;$age&#41;;?&gt;
A. Array ( [Harry] => 21 [Ron] => 23 [Malfoy] => 21 )
B. Array ( [HARRY] => 21 [RON] => 23 [MALFOY] => 21 )
C. Array ( [HARRY] => 21 [RON] => 23 )
D. Array ( [Harry] => 21 [Ron] => 23 )
Answer:A
&lt;?php$age = array&#40;&quot;Harry&quot; =&gt; &quot;21&quot;, &quot;Ron&quot; =&gt; &quot;23&quot;,&quot;Malfoy&quot; =&gt; &quot;21&quot;&#41;;array_change_key_case&#40;$age, CASE_UPPER&#41;;array_pop&#40;$age&#41;;print_r&#40;$age&#41;;?&gt;
A. Array ( [Harry] => 21 [Ron] => 23 [Malfoy] => 21 ) B. Array ( [HARRY] => 21 [RON] => 23 [MALFOY] => 21 ) C. Array ( [HARRY] => 21 [RON] => 23 ) D. Array ( [Harry] => 21 [Ron] => 23 )