$($b$)$ The two loading$/$displacement curves shown below were obtained by nanoindentation tests of surfaces of two different materials, $"A"$ and $"B",$ using a diamond indenter. During the experiments, a $5$ minute holding time was applied to both materials at the maximum load. The marks on the two materials created by the indenter have the same size and area.

A

B

$($i$)$ Which material exhibits a larger creeping behaviour?

$($ii$)$ Which material is tougher?

$($iii$)$ Which material is harder?