&lt;?php$color1 = &quot;red&quot;;$color2 = &quot;green&quot;;echo &quot;$color1&quot; + &quot;$color2&quot;;?&gt;
A. redgreen
B. red green
C. 0
D. error
Answer:A
&lt;?php$color1 = &quot;red&quot;;$color2 = &quot;green&quot;;echo &quot;$color1&quot; + &quot;$color2&quot;;?&gt;
A. redgreen B. red green C. 0 D. error
Explanation: + operator does not join both the strings.