Comprehensive and Detailed Explanation From Exact Extract:

From theCTFL-AT Syllabus v4.0, Section 1.3The Whole-Team Approach, the benefit of the whole-team approach is:

"All team members, including testers, work together in all project phases. This encourages collaboration and shared responsibility, which leads to the availability of working software and immediate feedback on changes."

Specifically, it is noted:

"One benefit of the whole-team approach is the continuous availability of working, executable software, which can be tested at any point in the iteration."

This makesOption Athe correct answer.

Let’s analyze the others:

Option Brelates toAcceptance Test-Driven Development (ATDD), not the whole-team approach specifically.

Option Cis a benefit ofTDD, not of the whole-team approach.

Option Drefers tocontinuous integration, not directly tied to the whole-team concept.