Q2 (10): A linked-list based stack S has few elements in it as shown below: What will stack look like after following operations are performed on it: a. S.pop() b. S.pop() c. S.push(52) d. S.push(36) e. S.peek() f. S.push(28) g. S.pop() Q3 (10): A program creates a queue. The program takes array of user names as String and then performs following operations: - If the user name starts with A to S, it will add (enqueue) to the queue - If the user name starts with T to Z, it will remove (dequeue) one element from the queue and then add the user to the queue. What will the queue look like if the input array is as follows? Please clearly label front and rear of the queue. ["Saeed", "Akram", "Jamal", "Tanveer", "Usman", "Ahmed", "Dawood", "Waheed"] Q4 (10): Please run the ticket counter simulation code with following parameters: a. Number of customers per day =300 b. Single Customer Service Time =7 minutes c. A customer arrives in the system every 30 seconds How many cashiers are needed to keep the average customer wait and processing time to be below 10 minutes