What type of service does the TSA provide?

The Transportation Security Administration (TSA) primarily focuses on ensuring the safety and security of the traveling public in the United States. This involves oversight of passenger and baggage screening processes at airports. The TSA's role includes setting security policies, conducting screenings of individuals and their belongings to prevent prohibited items from being taken onto aircraft, and managing security personnel to maintain compliance with federal regulations. This responsibility is critical for the overall safety of air travel, making the selected answer correct.

The other options, while related to airport operations, do not accurately represent the TSA's primary mission. Airport terminal management, customs and immigration services, and airport landscaping services are handled by different agencies or organizations, each with its distinct responsibilities that do not fall under TSA's jurisdiction.