A Shout Option

A shout option

A) Is like a barrier option but in which the option holder gets to choose a barrier at any point.
B) Is effectively an American option which can be exercised at any time before maturity.
C) Is an option where you can lock-in "early-exercise" profits at any one point and receive, at maturity, the maximum of these locked-in profits or the moneyness of the option at maturity.
D) Is a Bermudan option with only one specified early-exercise date, that is, it can be exercised early on that given date or at maturity.