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

In relation to 'conduct' under s 18 of the ACL, Accounting Systems 2000 v CCH Australia Ltd (1993) 42 FCR 470 is authority for the principle that:

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