Consider the partially-filled array named a. what does the following loop do? (cin is a scanner object)

int[] a = {1, 3, 7, 0, 0, 0};
int size = 3, capacity = 6;

int value = cin. nextint();
while (size < capacity & & value > 0)
{
a[size] = value;
size++;
value = cin. nextint();
}

1. reads one value and places it in the remaining first unused space endlessly.
2. crashes at runtime because it tries to write beyond the array.
3. reads up to 3 values and places them in the array in the unused space.
4. reads up to 3 values and inserts them in the array in the correct position.