A supermarket manager wants to poll customers coming to shop with regards to a proposed change to the bakery.The manager puts a display at each entrance of the store, the display has information on the proposed changes, and has sheets of paper that a customer can provide their feedback and drop it in a secure box.This type of sampling is known as

A.

systematic random sampling.

B.

voluntary response.

C.

cluster sampling.

D.

stratified random sampling.

E.

simple random sampling.