A car has rolled several times and is on its roof. Closer inspection reveals the unrestrained driver lying in her back with the back portion of the roof collapsed. At this time, which one of the following instructions should you give first?

a. "Let's open the doors and use them for support."
b. "We need to take the weight off of the posts."
c. "We need to climb in to assess the patient."
d. "Let's forcibly remove the back door."