What is the most appropriate response to Ms. Paris question about the policy at play
a. "I'm not sure, I will have to check with our HR department and get back to you."
b. "I believe the policy is that PTO requests need to be submitted at least two weeks in advance."
c. "I think the policy is that PTO requests are granted on a first-come, first-served basis."
d. "I'm not familiar with the specific policy, but I can find out for you."