Why is testing for validity so important?

Multiple choice question.

Because it allows human resource managers to ascertain who of the employees is most reliable and base bonuses on this information

Because managers need reliable information in order to hone their interview questions for and plan for training of potential recruits and new staff

Because by testing for reliability, it helps rule out certain job tasks or specifications when recruiting potential employees

Because it measures the degree to which the tool or test can measure a candidate's or an employee's performance on a task or job in question