Final answer:
Gaussian filter and Mean filter are used to control Gaussian noise in an image by averaging the pixel values and reducing the high-frequency noise.
Step-by-step explanation:
A. Gaussian filter and B. Mean filter would be used to control Gaussian noise in an image.
Gaussian filter is a low-pass filter that smooths out the noise by averaging the pixel values and reducing the high-frequency noise. Mean filter is also a low-pass filter that calculates the mean value of the pixel neighborhood to remove noise.