Which of the following commands prints out the headers of packets regarding the boolean expression?

tcpdump captures packets on a specified network interface and outputs their headers - source/destination IP, ports, protocol flags, and sequence numbers - to standard output based on a boolean filter expression using operators such as 'and', 'or', and 'not'. It operates at the packet level by using the libpcap library to read raw frames, making it the definitive tool for low-level network inspection and troubleshooting.

vmstat reports virtual memory, process scheduling, and CPU statistics for the operating system - it has no capability to capture or display network packet headers.

iftop displays real-time network bandwidth consumption per host pair on an interface - it does not capture packet headers or support boolean filter expressions.

iostat reports CPU utilization and disk I/O throughput statistics for block devices - it performs no network packet capture or header analysis.