I believe the answer is: c. were not a part of the contract unless Chloe expressly agreed to them.
Additional terms cannot be considered as a part of the main contract. For an additional term become legally binding, there are several criterias that shall be met:
(a) the signers expressly conveys acceptance to the terms of the offer;
(b) the material would not be altered
(c) There is no notification of objection to them is given after the notice is received.