What is the right design for this ….?

The Administrator is creating a login flow for a new application which will be deployed on Salesforce. The ….. create an automation logic to help validate the credentials and access.

What is the right design for this ….?
A . Leverage Screen Flow for displaying the input fields and custom apex triggers for the post login and process.
B. Leverage Screen Flow for displaying the input fields and for handling the post login and process.
C. Leverage Process Builder with Workflow rules for displaying the input fields and for handling the post login and process.
D. Leverage Screen Flow for displaying the input fields and autolaunched flow for handling the post login and process

Answer: B