Which of the Following Statements Regarding Drug Testing of Public

Which of the following statements regarding drug testing of public and private employees by employers is true?

A) There are greater limits on drug testing in relation to public employees as compared to private employees because public employees have rights under the U.S.Constitution.
B) There are greater limits on drug testing in relation to private employees as compared to public employees because private employees have rights under the U.S.Constitution.
C) The limits on drug testing are the same in relation to public and private employees because both categories of employees have rights under the U.S.Constitution.
D) There are no U.S.Constitutional limits on drug testing in relation to either public or private employees because neither category has rights under the U.S.Constitution.