Answer:
Reliability
Step-by-step explanation:
Reliability in general means something which performs something consistently over a long span of time.
In terms of tests, reliability is the degree of consistency of a measure of a specific element over a span of time. In other words, the thing that a test is measuring gives the same result consistently over a long span of time then the test is said to be reliable.
Here, Sandra's performance in the test was same after a span of time hence, the test is reliable.