Although choice of standard quantity is arbitrary, however several criteria must be met if a standard is to be useful as possible. Choose the correct criteria.

Options

A. Measurements made at diefferent times using the same standard can be meaningfully compared only if standard does not vary with time.
B. Measurement made at different places can be compared if standard is reproducible.
C. The standard should be safe from all possible causes of damage
D. The standard should be readily accessible to every one who needs to use it.

Answer

A, B, C, D