Assume that a pipeline has 4 stages:

S1 = fetch instruction

S2 = decode and calculate effective address

S3 = fetch operand

S4 = execute instruction and store results

The following code segment would be processed as follows in this pipeline:

Time Period:	1	2	3	4	5	6
R1 = R2 + X	fetch instr.	decode	fetch X	Add & store in R1
X = R3 + Y		fetch instr.	decode	fetch Y	Add & store in X
Z = R1 + X			fetch instr.	decode	fetch X	Add & store in Z

At which time period is there a resource conflict and at which time period is there a data dependency?