The Attitude of Central Banks and Commercial Banks Toward Bankers

The attitude of central banks and commercial banks toward bankers' acceptances:

A) has been unfavorable regarding bankers' acceptances as attractive long-term commitments
B) has never been constructive and has, in fact, been in opposition to their use at times
C) is one of approval provided that before investing in such instruments guarantees can be obtained from the Export-Import Bank
D) is irrelevant, since they are prevented from investing in such instruments by regulations or laws
E) none of the above