In agile Web design, what phase involves writing JavaScript code to assist in form field validation?

• A. The test phase
• B. The delivery phase
• C. The develop phase
• D. The design phase

Answer: (C)

The development phase is where you turn requirements into working code. Writing JavaScript to validate form fields is a coding task that implements the actual functionality—checking that fields are filled in, that emails look correct, that passwords meet rules, and so on. This happens during development, when developers build and refine features.

The design phase focuses on how the form looks and feels to the user, not on implementing the validation logic. The test phase is for verifying that the already-implemented code works correctly and meets requirements. The delivery phase centers on packaging and releasing the product. So, writing the validation logic with JavaScript belongs in the development phase.