You have been asked to estimate the testing effort for an upgrade to a legacy...

Estimation Technique Selection:

Extrapolation uses historical data from similar projects to estimate effort for a new one.

Since the current upgrade is 10% larger than the previous one, extrapolation is the most straightforward method.

Evaluation of Options:

A(Function points) focuses on size estimation and is not specific to historical data.

C(Planning poker) andD(Three-point estimation) involve collaborative or probabilistic techniques, not a direct extrapolation.

Bis correct as it directly applies historical project data to estimate effort.

References and Syllabus Alignment:

Effort estimation techniques are covered under "Test Estimation" (TM-2.2.1) in the syllabus​​.