Answer:

If locker rent is not paid, the bank has the right to take certain actions to recover the unpaid amount. These actions are aimed at protecting the bank's interests and ensuring that the locker is not misused or abandoned. The correct answer is option 'D', which states that the bank can take any or all of the following actions:

Seal the Locker:
- The bank can seal the locker if the rent is not paid on time. Sealing the locker prevents the customer from accessing the contents of the locker until the outstanding rent is cleared.
- This action is taken to protect the bank's interests and ensure that the customer fulfills their financial obligations.

Stop Operation of Locker:
- In addition to sealing the locker, the bank can also stop the operation of the locker if the rent remains unpaid.
- Stopping the operation of the locker means that the customer will not be able to use or access the locker until the outstanding amount is settled.

Break Open the Locker:
- If the customer continues to default on the rent payment despite previous actions, the bank can ultimately decide to break open the locker after giving suitable notice.
- Breaking open the locker is considered as a last resort and is done to recover any unpaid rent or to check for any abandoned or illegal items stored in the locker.
- This action is taken in accordance with the terms and conditions agreed upon between the bank and the customer.

Summary:
- In summary, if the locker rent is not paid, the bank has the right to seal the locker, stop its operation, and ultimately break it open after suitable notice.
- These actions are taken to protect the bank's interests and ensure that the locker is not misused or abandoned.
- It is important for customers to fulfill their financial obligations and pay the rent on time to avoid any disruption in accessing their locker and to maintain a good relationship with the bank.