Confidentiality Clause Which Clause Of The UK DPA Covers Client Confidentiality And Keeping Computer Records?

Which clause of the UK DPA covers client confidentiality and keeping computer records? - confidentiality clause

I try to do my homework on the client confidentiality, but has trouble finding the information to the Department of Political Affairs, which covers the customer's data storage on a computer. Even though I know the answer, I only support it with evidence and details that fans Clinet information processing rather than storage. Any help in the clause is that it would be very appreciated.