PLEASE HELP

If an HR manager is reviewing a list of interview questions to ensure that they will accurately measure the employee characteristics she is looking for, she is checking for?

a. cognition
b. trustworthiness
c. validity
d. reliability

Which of the following is a principal to keep in mind when creating screening methods?
a. Screening methods are the same for everyone
b. Screening methods could differ according to the type of job
c. Screening includes a structured interview
d. Screening includes a valid test if one is available