what is the output of following javascript code script type text..., Function, Javascript

Question:What is the output of following JavaScript code?<script type="text/javascript">

function sum(x){
   function add(y){
     return x+y;
   }
   return add;
}

function callme(){
  result=sum(5)(5);
  alert(result);
}

callme();

</script>

A 10 
B 5 
C error 
D none

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Question:What is the output of following JavaScript code?<script type="text/javascript"> function sum(x){ function add(y){ return x+y; } return add; } function callme(){ result=sum(5)(5); alert(result); } callme(); </script>

A 10

B 5

C error

D none

A

Question:What is the output of following JavaScript code?
<script type="text/javascript"> function sum(x){ function add(y){ return x+y; } return add; } function callme(){ result=sum(5)(5); alert(result); } callme(); </script>