Academy/Intro to Network Traffic Analysis/Dissecting Network Traffic with Wireshark Questions

Hello friends, I am stuck on this question, I have tried all the combinations but nothing works for me
tcpdump -Xr /tmp/capture.pcap
tcpdump -X -r /tmp/capture.pcap
tcpdump -rX /tmp/capture.pcap
tcpdump -r -X /tmp/capture.pcap

Please some help!!