what will produce for the following javascript code script var stringnum..., Operators, Javascript

Question:What will produce for the following javascript code:<script>
var stringNum="4";
var stringNum2="20";
var mulEm=stringNum*stringNum2;
document.write(mulEm);
</script>

A 80 
B 420 
C Syntax Error 
D no output

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Question:What will produce for the following javascript code:<script> var stringNum="4"; var stringNum2="20"; var mulEm=stringNum*stringNum2; document.write(mulEm); </script>

A 80

B 420

C Syntax Error

D no output

A

Question:What will produce for the following javascript code:
<script> var stringNum="4"; var stringNum2="20"; var mulEm=stringNum*stringNum2; document.write(mulEm); </script>