Under a "Crawling Peg" System,a Country's Exchange Rate

Under a "crawling peg" system,a country's exchange rate

A) is fixed except for small, surprise changes.
B) changes at a predetermined rate against the dollar or some other major currency.
C) can fluctuate within a narrow band.
D) can change, but the changes are kept secret from the public.
E) is determined by the central bank of another country.