Able, on behalf of Pix Corp, entered into a contract with Sky Corp, by which Sky agreed to sell ...

Able, on behalf of Pix Corp, entered into a contract with Sky Corp, by which Sky agreed to sell computer equipment to Pix. Able disclosed to Sky that she was acting on behalf of Pix. However, Able had exceeded her actual authority by entering into the contract with Sky. If Pix wishes to ratify the contract with Sky, which of the following statements is correct?
 a. Pix must notify Sky that Pix intends to ratify the contract.
  b. Able must have acted reasonably and in Pix's best interest.
  c. Able must be a general agent of Pix.
  d. Pix must have knowledge of all material facts relating to the contract at the time it is ratified.