For a beam with a concentrated force, which one of the following is true?

A、Atthepointofconcentratedforceaction,theshearingforcediagramandbendingmomentdiagrambothhaveabruptchange;
B、Atthepointofconcentratedforceaction,thereisabruptchangeinshearforcediagramandnoabruptchangeinbendingmomentdiagram;
C、Atthepointofconcentratedforceaction,thereisnoabruptchangebothinshearforcediagramandbendingmomentdiagram;
D、Atthepointofconcentratedforceaction,thereisnoabruptintheshearforcediagramandthereisabruptchangeinthebendingmomentdiagram