As It Is Usually Practiced, Inflation Targeting Sets

As it is usually practiced, inflation targeting sets

A) a specific inflation rate for the central bank to target and prohibits it from deviating from the target even when some shock pushes inflation away from that number.
B) a specific inflation rate for the central bank to target but allows it to deviate from the target when some shock pushes inflation away from that number.
C) sets some range of inflation rates for the central bank to target but prohibits it from deviating from that range even when some shock pushes inflation outside the range.
D) sets some range of inflation rates for the central bank to target but allows it to deviate from that range even when some shock pushes inflation outside the range.