what will be the output of following code var1 a b..., PHP Fundamentals, PHP

Question:What will be the output of following code?$var1="a";
$$var1="b";
echo "$var1 $a";

A a b 
B $var1 $a 
C Error: $a is undefined 
D Error: Parse error in line 2 ($$var1 = "b")

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Question:What will be the output of following code?$var1="a"; $$var1="b"; echo "$var1 $a";