Which of the following would constitute a proper delivery of a deed?

a. Escrow mailing the deed to the Grantee after signed by seller, and after all other requirements of the escrow had been met, but also after the seller had died.
b. After signing, seller gave to broker with instructions to give it to buyer.
c. Escrow delivers deed to buyer without completed (signed) instructions.
d. After signing the deed, Grantee personally delivers to Grantor.