You are the project lead of a large application development project to implement an e$-$commerce portal for your client. You are now at the end of system testing and would like to understand how robust the initial requirements phase of the project was. Which of the following would be the best metric for this?

Select one:

a$.$ Number of change requests post requirements phase

b$.$ None of the other answers is correct

c$.$ Number of defects by origin phase

d$.$ Number of initial requirements $($end of requirements phase$)/$total number of requirements currently