Which of the Following Best Describes the Two-Tier Database Architecture

Which of the following best describes the two-tier database architecture?

A) The user accesses a database server using a terminal.
B) The user interface, data-processing logic, database access and data validation functions are performed on a mainframe server.
C) The user interface and data validation functions are performed by the client whereas the data-processing logic is performed on a server.
D) The user interface and data-processing logic are performed by the client whereas the server handles database access and data validation functions.