Elance Exams Answers PDF file

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What is the purpose of calls to glLogicOp(GLenum opcode)?

A function that returns the error values from OpenGL after performing a "GL logical operation"
A logical operation applied between one buffer and another during full-screen copying.
A logical operation applied between RGBA color and RGBA color at the corresponding location.
It serves no purpose and has been deprecated since version 1.
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