Question about Reguation 4 "Reliably"

Hello

I have a question about regulation 4 (The Reliably Regulation) It says the claimant must be able to do an activity:-

safely
to an acceptable standard
repeatedly
in reasonable time

My question is do you need to meet all of those criteria or can one or two be sufficuant. For example if it was unsafe for a person to walk out alone because of a physical disability but they could do it to an acceptable standard, repeatedly and in a reasonable time would they not satisfy that activity because they only meet one of the relaibility criteria in regulation 4?

Thank you in advance for your assistance.
Waxwing