Which of the Following Control Activities Ensure That the Hours

Which of the following control activities ensure that the hours worked by a contractor are valid?

A) The contractor provides a weekly printout of time charged per job from his company's system.
B) All employee time should be positive and bear a reasonable relationship to the standard 40-hour work week.
C) Claims for large hours or excessive wage rates are reviewed quarterly by the Vice President of Human Resources.
D) The contracting office provides the names and tax identification numbers of all contractors prior to the processing of payroll.