Which of the Resource Records defines zones, which roughly correspond to domains?

Which of the Resource Records provides a translation from IP address to name?

Which of the Resource Records translates host names to IP addresses?

Which of the files defines the groups known to the system?

Which of the dispay controller (CRTC) registers defines the total number of dot clocks per line?

Which field in the SOA record specifies the length of time that remote name servers should cache records from this zone?