If you put the "ip helper-address 10.10.0.4" on the 10.12.0.1 router's 10.12.x.x interface the 10.10.0.1 router will automatically forward the bootp request to the server once it receives it because the 10.12.x.x router turns the bootp request into a unicast.
I hope this answers your question. Please let me know if you need anything else.
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