65. Concerning the scintigraphic detection and localization of gastrointestinal bleeding, which of the following is true?

A) Its noninvasiveness justifies its use in spite of the fact that it is less sensitive than selective arteriography.
B) As soon as the extravascular focus of increased activity is identified, one should terminate the acquisition.
C) It is more sensitive than selective angiography but less specific.
D) A limitation of using Tc-99m labeled RBCs is the continued accumulation of activity in the liver and spleen, obscuring the upper abdomen.
E) Important criteria for the identification of a bleeding site is extravascular activity that is fixed in time.