In Relation to 'Conduct' Under S 18 of the ACL,Henjo

In relation to 'conduct' under s 18 of the ACL,Henjo Investments Pty Ltd & Ors v Collins Marrickville Pty Ltd (1988) 79 ALR 83 is authority for the principal that:

A) silence can constitute misleading and deceptive conduct where there is a duty to disclose relevant facts.
B) pre-contractual representations can constitute misleading and deceptive conduct.
C) an advertisement which compared a competitor's products unfavourably with the advertiser's products can constitute misleading and deceptive conduct.
D) the act of making a contract containing a false warranty is sufficient to constitute misleading and deceptive conduct.