Answer: Cyclic redundancy check number
Explanation:
Cyclic redundancy check number (CRC) is the process through which the accidental errors are detected through the codes in a particular communication path and digital networks. They can identify the small defects or errors occurring in data by observing checksum result ,so can be detected while transmission.
Other options are incorrect because random variable check number detects the error of occurring in sequence of random variable.Cyclic repetition check number is checking of defects in numbers through reoccurring method.Cyclic random check number is continuously checking the error in random numbers