Consider the executing the following code on the pipelined datapath of figure below:

add $15, $14, $13

add $10, $11, $12

sub $1, $2, $3

add $9, $8, $7

sub $6, $5, $4

At the end of the sixth cycle of execution, which registers are being read and which register will be written?

Hazard detection unit ID/EX MemRead IDIEX EXIMEM Control WB MEM/WB IFIID Registers ALU PcInstruction Data IF/ID.RegisterRs IF/ID.RegisterRt IF/ID.RegisterRt IF/ID.RegisterRd ID/EX.RegisterRt Rs Forwarding unit Hazard detection unit ID/EX MemRead IDIEX EXIMEM Control WB MEM/WB IFIID Registers ALU PcInstruction Data IF/ID.RegisterRs IF/ID.RegisterRt IF/ID.RegisterRt IF/ID.RegisterRd ID/EX.RegisterRt Rs Forwarding unit