Most modern diodes are based on semiconductor ( ). In a p-n diode, conventional current can flow from the ( ) side (the anode) to the ( ) side (the cathode), but cannot flow in the ( ) direction. ( )
A.
p-n junction, p-type, n-type, opposite
B.
p-n junction, n-type, p-type, opposite
C.
n-p junction, A-type, K-type, opposite
D.
p-n junction, A-type, K-type, opposite