What is the command used to create a binary log file using tcpdump?

A.
tcpdump -r log

B.
tcpdump -w ./log

C.
tcpdump -vde -r log

D.
tcpdump -l /var/log/

Explanation:
tcpdump [ -adeflnNOpqStvx ] [ -c count ] [ -F file ] [ -i interface ] [ -r file ] [ -s snaplen ] [ -T type ] [ -w file ] [ expression ]

-w Write the raw packets to file rather than parsing and printing them out.