The Transdermal Patch

The transdermal patch:

A) provides effective protection against STIs.
B) must be kept on the skin continuously throughout the month, to be replaced by a new patch at the beginning of the next month.
C) works by releasing hormones through the skin into the blood stream.
D) provides a lower dose of estrogen than other forms of hormonal birth control, thus reducing the risk of blood clot or stroke.