Quiz: Rotated Array

In a rotated sorted array $[4,5,6,7,0,1,2]$, how do you determine which half is sorted?

1. A.The half with more elements is sorted
2. B.Compare $arr[mid]$ with target
3. C.Compare $arr[mid]$ with $arr[left]$: if $arr[mid] \geq arr[left]$, left half is sorted
4. D.The half containing the minimum is sorted