What is the recommended solution as Architect should consider?
Universal Containers (UC) has built a custom token-based Two-factor authentication (2FA) system for their existing on-premise applications. They are now implementing Salesforce and would like to enable a Two-factor login process for it, as well.
A. Use the custom 2FA system for on-premise applications and native 2FA for Salesforce.
B. Replace the custom 2FA system with an AppExchange App that supports on-premise application and salesforce.
C. Use Custom Login Flows to connect to the existing custom 2FA system for use in Salesforce.
D. Replace the custom 2FA system with Salesforce 2FA for on-premise applications and Salesforce.

Assume the existence of a bankaccount class. define a derived class, savingsaccount that contains two instance variables: the first a double, named interestrate, and the second an integer named interesttype. the value of the interesttype variable can be 1 for simple interest and 2 for compound interest. there is also a constructor that accepts two parameters: a double that is used to initialize the interestrate variable, and a string that you may assume will contain either "simple", or "compound", and which should be used to initialize the interesttype variable appropriately. there should also be a pair of functions getinterestrate and getinteresttype that return the values of the corresponding data members (as double and int respectively).