Which Statement About Presidential Decrees Is CORRECT

Which statement about presidential decrees is CORRECT?

A) They have been used more extensively by Putin and Medvedev than Yeltsin.
B) Presidential decrees have not been used to affect the bureaucracy.
C) Such decrees cannot violate the constitution but can violate specific pieces of legislation.
D) They must be approved by the Russian Duma if they relate to deploying troops abroad.
E) They allow presidents to ignore uncooperative parliaments.