One morning, a bank observes that all data of CBS are encrypted and so they cannot retrieve any information. What is this sign of? How does the bank recover data? What measures should be taken to prevent future similar incidents?

A bank needs to upgrade 30 existing applications and implement 10 new applications where all applications need CPU, memory and storage. Which solution will be more feasible to cater the demand of resources allocation considering cost effectiveness and manageability?

Discuss the challenges and solutions associated with ensuring the security of Internet and App Banking.