A number that is used to control the form of another number is known as

The correct answer is: B. Mask

A mask is a number that is used to control the form of another number. It is used to select certain bits of a number and to ignore others. For example, if you have a number 123456789 and you want to mask the last 4 digits, you would use the mask 00000000. This would result in the number 1234.

The other options are incorrect. A map is a representation of a physical area or region on a flat surface. Mamtossa is not a word in the English language. Marker is a device or substance used to mark or indicate something.