Comprehensive and Detailed Explanation From Exact Extract:

FromCTFL-AT Syllabus v4.0, Section 4.1The Test Pyramid, it states:

"The test pyramid concept encourages more tests at lower levels (e.g., unit tests), with fewer tests at higher levels (e.g., system or UI tests), in order to find and fix defects as early as possible."

Therefore,Option Ais correct — thetest pyramid supports early defect detectionthrougha high volume of lower-level automated tests.

Option Bis incorrect — thetest pyramid emphasizes more tests at lower levels, not higher.

Option Cis incorrect — Agile doesn't mandate four specific levels in every system.

Option Dmisrepresents the pyramid —technology-facing tests (e.g., unit tests)areat the bottom, not the top.