DKIM/SPF setup

DKIM/SPF setup

My host is asking the following questions to get this setup:

  1. What kind of record are they wanting you to make? An SRV record or a TXT record? Can you get more details on that one?
  2. It also asks for a public key. Is it regarding the DKIM record as a public Key or is there additional information they gave you?
Thx.