Arrange the pairings of US and CS in classical conditioning in terms of onset of US in relation to CS starting from the earliest
A. Backward
B. Simultaneous
C. Delayed
D. Trace
Choose the correct answer from the options given below:
1
A, B, C, D
2
D, B, C, A
3
C, D, B, A
4
D, C, A, B