Czonka is fired from his job at 59, after 21 years with NorthStar Corporation. He sues in federal court under the Federal Age Discrimination in Employment Act (ADEA), claiming he that he was fired based on his age. Two months after filing suit, Czonka's counsel learns that Roh, one of his supervisors at NorthStar, has just retired, and is about to move to South Korea. Although discovery has just begun, NorthStar has noticed Roh's deposition. Czonka's counsel should

a. prepare fully as possible for the deposition, and cross-examine Roh as if she were doing so at trial

b. object and move for a protective order under Rule 260, on the ground that discovery has just begun, so that she is not yet prepared to cross-examine Roh at the deposition

c. attend the deposition, but not cross-examine Roh, if Roh is willing to talk privately to her about the case

d. object on the ground that Roh cannot be deposed, since Roh is not a party to the case