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

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

Correct Answer: int[] a = new int[5]; a = new int[10];

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