Differentiate between validity and reliability. a. Validity is the ability of an instrument to measure what it is supposed to measure whereas reliability is the ability of an instrument to yield consistent results with repeated use.b. Validity is the ability of an instrument to yield consistent results with repeated use whereas reliability is the ability of an instrument to measure what it is supposed to measure.c. Validity is the ability to determine cause and effect whereas reliability is the process that provides quantitative information.d. Validity is the process that provides quantitative information whereas reliability is the ability to determine cause and effect.