Which quality allows programmers to modify a program as and when required
a) portaility
b) structure
c) generality
d) flexibility

d. flexibility

Explanation:

Flexibility in its generic term is a measure of how bendable a thing is. It connotes how easily changes can be made to an object.

In the software context, flexibility is the adaptability of a program to future modifications. It is a quality of a program, software or application that allows programmers to modify it when required.

Flexibility allows to modify codes without having to re-write them. If software applications were not flexible, making new and updated releases of them would be a herculean task.