For each operation, how many elements must be shifted? Assume no new memory needs to be allocated. Questions are for vectors, but apply to arrays too. 1) Append an item to the end of a 999-element vector (e.g, using push.back0) Check Show answer 2) Insert an item at the front of a 999-element vector. Check Show answer 3) Delete an item from the end of a 999-element vector. Check Show answer 4) Delete an item from the front of a 999-element vector Check Show