4GL is an example of ________________ processing?

4GL is an example of ________________ processing?

A. White Box
B. Black Box
C. Functional
D. Both Black Box & Functional

Explanation: Functional processing/testing is also referred to as black box testing in which contents of the black box are not known.Almost anything might be referred to as a black box:an algorithm or the human mind.Functionality of the black box is understood in terms of its inputs and outputs.