PNC Checks (113A/23)

Could you please tell me how regularly serving officers and police staff have their details checked against the national police database (as NPCC guidance now says it should be) for potential criminality or concerns about their behaviour?

Are they:

1. A) Checked against it when they apply/join the force in the first instance?
2. B) How often are they checked against it during their employment, assuming no adverse information/cause to do so has been raised?
3. C) If your force will check all of its officers and police staff against the database?