The following question involves the class QueueInterface which contains all the functions required for a queue. QueueInterface contains elements of type int. i. Write the definition for QueueInterface. ii. Define a class called VectorQueue which inherits from QueueInterface. VectorQueue uses a vector for its queue. iii. Implement a new function of VectorQueue that returns an element of the queue without removing it from the queue. You will need to decide which element to return. Explain your choice of element