________ is intended to show that a system both conforms to its specifications and meets the expectations of the system customer.

Explanation

This is Sommerville's definition of software validation (verification and validation), whose purpose is to show that the system conforms to its specification and that it meets the expectations of the customer who is paying for it. Software specification is the earlier activity of defining what the system should do, and software design decides how it will be structured, so neither of them demonstrates conformance. 'Software evaluation' is not one of the four fundamental software process activities. Therefore option (iv) is correct.