Neural Networks Based on Hebb's Rule ____;However,back-Propagation Systems ____

Neural networks based on Hebb's rule ____;however,back-propagation systems ____.

A) require extensive training;require a "teacher" to provide feedback on performance
B) require feedback;are self-correcting
C) process several sequences simultaneously;are self-correcting
D) are self-correcting;require a "teacher" to provide feedback about performance