If a is an array of 5 integers then which of the following is the correct way to increase its size to 10 elements?

Question

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Accepted Answer

int[] a = new int[5]; 
a.Length = 10 ;

Answer

int[] a = new int[5]; 
int[] a = new int[10];

Answer

int[] a = int[5]; 
int[] a = int[10];

Answer

int[] a = new int[5]; 
a = new int[10];

Answer

int[] a = new int[5]; 
a.GetUpperBound(10);