Question: For the following operations, define the best - case runtime complexity in terms of n . static int Sum ( int n ) { int

For the following operations, define the best-case runtime complexity in terms of n.
static int Sum(int n)
{
int sum =0;
if (n ==0)
{
return;
}
for (int i =0; i < n; i++)
{
sum += Sum(n-1);
}
return sum;
}
Group of answer choices
O(n2)
O(1)
O(n!)
O(n)

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