As above from JW and AD, the procedure was simple and safe. The variant which I recall had ‘Decide’ at 15 ft above DH with either a ‘Land’ or a ‘GA’ response before DH (~2 sec later). With the latter the PF pressed GA for an automatic GA. In both instances the Captain continued monitoring.
The ‘wags’ view of having no response – default to GA, was (no response) “the Captain is dead – long live the new Captain” – ‘Land’. In reality this was an accepted procedure to cover the rare circumstance of an incapacitated Captain, thus the autoland option was the safest course of action.
During research flying which investigated the limitations of human capability in fog - auto disengagement or manual take over, the procedure was modified to include the Captain tapping the hand of the PF. This confirmed the decision to land and overcame intercom blocking if the visual scene / workload was being described.