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

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

1.A logical operation applied between RGBA color and RGBA color at the corresponding location.

2. A logical operation applied between one buffer and another during full-screen copying.

3.It serves no purpose and has been deprecated since version 1.

4.A function that returns the error values from OpenGL after performing a “GL logical operation”

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