Question $1)$ Select any three options $($from A to L$)$ below that represent queues, and in your own words, explain why or why not they can $($or cannot$)$ be considered as queues.

Customers waiting in a checkout line

A deck of playing cards

A file directory system

A line of cars at a tollbooth

Laundry in a hamper

A group of friends having a picnic

A set of books on a bookshelf

A crowd of people watching a parade

A stack of papers on a desk

A pack of wolves hunting in a forest

A cluster of stars in a galaxy

A collection of flowers in a garden.

Question $2)$ Describe the operations that used to modify a queue.

Question $3)$ The front of a queue containing the items a b c is on the left. After two pop operations, explain the items in the queue. Add a code snippet to support your solution.

Question $4)$ The front of a queue containing the items a b c is on the left. After the operation add$($d$),$ explain the items in the queue. Add a code snippet to support your solution.