Irule Configuration from DNS Traffic Client redirect to Node

Hi guys I get a new case in my lab,

traffic from client will access used from DNS

1. domainA.com which is this domain will be redirect to server node A

2. domainB.com which is this domain will be redirect to server node B 

3. domainC.com which is this domain will be redirect to server node C

I have idea for this case using irule configuration in LTM, but im trying using some irule configuration, but its not working, can you give me suggest for irule command?