&lt;?phpfunction constant&#40;&#41;&#123;    define&#40;&quot;GREETING&quot;, &quot;Welcome to Narnia&quot;&#41;;    echo greeting;&#125;?&gt;
A. Welcome to Narnia
B. greeting
C. GREETING
D. ERROR
Answer:A
&lt;?phpfunction constant&#40;&#41;&#123;    define&#40;&quot;GREETING&quot;, &quot;Welcome to Narnia&quot;&#41;;    echo greeting;&#125;?&gt;
A. Welcome to Narnia B. greeting C. GREETING D. ERROR
Explanation: By default constants are case sensitive. Hence an error will arise.