V-Model is
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A software development model that illustrates how testing activities integrate with software development phases
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A software life-cycle model that is not relevant for testing
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The official software development and testing life-cycle model of ISTQB
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A testing life cycle model including unit, integration, system and acceptance phases
The V-Model is a software development model that shows the relationship between each development phase and its associated testing phase. Option A is correct because the V-Model illustrates how test activities (unit, integration, system, acceptance) correspond to and integrate with development phases (requirements, specification, design, implementation). Option B is incorrect - the V-Model is highly relevant for testing. Option C is incorrect - there's no single 'official' ISTQB model. Option D describes a testing lifecycle but doesn't capture the V-Model's key feature: the mapping between development and verification phases.