Answer:send it to the owner after notifying the tenants by certified mail
Step-by-step explanation:
If you are acting on behalf of someone you need to always have a proof that you actual acted as requested, a certified email will actual be a legal proof to the tenant that you really did send the money to the owner. Otherwise if the owner says I didn't receive the deposit without the actual communication that proves to the he tenant that you did it may be an issue that may lead to conflict.