What Purpose Do the Minnesota Multiphasic Personality Inventory's (MMPI)validity Scales

What purpose do the Minnesota Multiphasic Personality Inventory's (MMPI) validity scales serve?

A) to indicate whether a test taker is likely to be lying,defensive,or evasive while answering the items
B) to make sure clinicians are scoring the test correctly
C) to prevent the test from being used to classify people as insane or not insane
D) to control for the effects of culture on the test taker