Answer:c)Clean redundant customer data
Step-by-step explanation:Data cleansing/cleaning is the activity for the elimination of the data which is not required for further use, corrupt, unnecessary etc by detecting it. The data that is being cleared is categorized by levels like irrelevant data, incorrect data, inaccurate data, redundant data etc.
The data is eliminated by the method of correcting , modifying, reducing unnecessary parts,deleting, etc.Thus, the correct option is option(C).