Question 7 (1 point) Valid consensus comprises a valid offer and valid acceptance of the offer. Which of the following is correct? When the postbox rule applies, acceptance of an offer is effective when and where the acceptance has been mailed, as opposed to when the offeror hears of the acceptance. An offer is valid and enforceable when: both contractual parties are identified the product is specified, and consideration is determinable. Although silence generally does not constitute "acceptnce" of an offer, an exception is when it is common practice between the parties that the buyer may accept the offer implicitly, i.e., without communicating acceptance. All of the above-mentioned are correct