Which of the Following Do You Think Are the Most

Which of the following do you think are the most critical characteristics in selecting a measure?

A) Validity: if a measure doesn't measure the concept it is supposed to measure, why bother?
B) Reliability: if a measure doesn't consistently give the same results when it's used under similar conditions, why bother?
C) Easy to use: if a measure is so complicated to use, regardless of its validity or reliability, why bother?
D) Accessible: if a measure is expensive or restricted, regardless if it is easy to use, valid, and reliable, why bother?
E) all of the above
F) none of the above