S&T Corporation retained Brooke to find sources of raw material for its products. (1) Identify and explain the three types of contractual authority Brooke may have when dealing with third parties. (2) Identify and explain each instance when Brooke may be held liable for the contract depending on the level of disclosure to the supplier (what is each type of disclosure and the accompanying liability?). Note that (1) and (2) are not tied together. They are separate answers.