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NIELIT 2016 MAR Scientist B - Section C: 13

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What error would the following function give on compilation? 

f(int a, int b) 
{ 
int a; 
a=20; 
return a; 
}
  1. Missing parenthesis is $\textit{return}$ statement.
  2. Function should be defined as $\text{int f(int a, int b)}$
  3. Redeclaration of $a$.
  4. None of these.
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This function can/will throw 2 errors.

The Options are B & C
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