what will be the output for following code let n math round..., Function, Javascript

Question:What will be the output for the following code?let n=Math.round(-20.51)
  document.write(n);

A 20 
B -20 
C -21 
D 21.5

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Question:What will be the output for the following code?let n=Math.round(-20.51) document.write(n);