In software engineering, the term verification is defined as:

A.
To establish the fitness or worth of a software product for its operational mission

B.
A complete, validated specification of the required functions, interfaces, and performance for
the software product

C.
A complete, verified specification of the overall hardware-software architecture, control
structure, and data structure for the product

D.
To establish the truth of correspondence between a software product and its specification

Explanation:
In the Waterfall model (W.W. Royce, Managing the Development
of Large Software Systems: Concepts and Techniques, Proceedings,
WESCON, August 1970).
* answer “A complete, validated specification of the required functions, interfaces, and
performance for the software product” defines the term requirements.
*Similarly, answer “To establish the fitness or worth of a software product for its operational
mission”, defines the term validation, and answer d is the definition of product design. In summary,
the steps of the Waterfall model
are:
System feasibility
Software plans and requirements
Product design
Detailed design
Code
Integration
Implementation
Operations and maintenance
In this model, each phase finishes with a verification and validation
(V&V) task that is designed to eliminate as many problems as
possible in the results of that phase.