Consider the following to answer the question below.

$$ASW$,$ a regional shoe$$ chain, has recently launched an online store. Sales via the Internet have been sluggish compared to their brick and mortar$$ stores, and management suspects that its regular customers have concerns regarding the security of online transactions. To determine if this is the$$ case, they plan to survey a sample of their regular customers.

Suppose that$$ ASW's regular customers belong to a rewards program and have a customer rewards ID number. ASW decides to randomly select $100$ numbers. What is this sampling method$$ called?

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Part $1$

A$.$

systematic

B$.$

cluster

C$.$

stratified

D$.$

convenience

E$.$

simple random