Evidence is not to be adduced if, on objection by a client, the court finds that adducing the evidence would result in disclosure of –

(a) a confidential communication made between the client and a lawyer; or

(b) a confidential communication made between 2 or more lawyers acting for the client; or

(c) the contents of a confidential document, whether delivered or not, prepared by the client, lawyer or another person –

for the dominant purpose of the lawyer, or one or more of the lawyers, providing legal advice to the client.