PLS HELP !! LAW QUESTION !!

Which of the following statements is incorrect?
a. A party making an offer can express how acceptance is to be communicated.
b. In communications between the parties by facsimile, the postal rule applies.
c. Generally an acceptance must be communicated to the offeror.
d. If a letter of acceptance is lost or delayed, a contract is still formed upon the letter being posted unless the offeror required communication or knowledge of the acceptance.
e. Upon communication of an acceptance, the place and time of formation of a contract become known to the parties.