Given below are two statements - one labelled Assertion (A) and the other Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

Evaluation tools must be reliable and valid, so any innovation in the evaluation system genuinely has to safeguard these two qualities, making the Assertion correct.

If the tools lack reliability and validity, the evaluation yields inconsistent and meaningless results, so its very purpose collapses, making the Reason correct.

The Reason explains precisely why the Assertion demands such safeguards, since the failure it describes is the reason innovations must protect these qualities.

Reliability refers to the consistency of scores across repeated measurement.

Validity refers to whether a tool measures what it actually claims to measure.

A tool can be reliable without being valid, but it cannot be valid without first being reliable.