Equivalence partitioning is
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A black box testing technique than can only be used during system testing
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A white box testing technique appropriate for component testing
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A black box testing technique used only by developers
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A black box testing technique appropriate to all levels of testing
Equivalence partitioning is a black-box testing technique that divides input data into valid and invalid classes to reduce test cases while maintaining coverage. It applies to all test levels - unit, integration, system, and acceptance testing. Options A and C incorrectly limit it to specific levels or roles (developers vs testers). Option B is wrong because it's not a white-box technique.
Equivalence partitioning is a black-box testing technique that divides input data into partitions expected to be handled the same way by the system, and it can be applied at any test level — unit, integration, system, or acceptance — not restricted to system testing alone or to any particular role like developers only. That generality is exactly what distinguishes it as a broadly applicable black-box technique.