Single loss expectancy (SLE) is calculated by using:

A.
Asset value and annualized rate of occurrence (ARO)

B.
Asset value, local annual frequency estimate (LAFE), and standard annual frequency estimate (SAFE)

C.
Asset value and exposure factor

D.
All of the above

Explanation:
C: The formula for calculating SLE is SLE = asset value (in $) exposure factor (loss in successful threat exploit, as %). Page 481.