In our design for a program, which of the following is NOT a valid reason for making ChompProgram extend CharMatrix, rather than having only one class ChompProgram and putting all the code from CharMatrix directly into it?

a. It reduces coupling.

b. CharMatrix becomes a generalpurpose reusable class.

c. The development work can be split between two programmers.

d. Both ChompProgram and CharMatrix classes become more cohesive.