What are two reasons to use a pooling layer in a Convolution Neural Network (CNN)? (Choose two)

What are two reasons to use a pooling layer in a Convolution Neural Network (CNN)? (Choose two)
A . to increase granularity of information
B . to make the feature map invariant to transformation
C . to extract features of different spatial scale
D . to extract a summarized value from an area of the image

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Answer: A,C