which of the following is correct regarding to a Margin Call.

Select one:

A. margin calls won't occur when securities' price increase.

B. A broker has a right to sell all of the investors' securities in case of his/her position declined and not adding more cash to the position.

C. an investors will be notified by the broker to add more cash when his/her ratio of securities' market value (as net of borrowed money) to securities' market value declined bellow Maintenance Margin Requirements.

D. all of the choices are correct.