Please choose the correct ending to complete the given sentence: Travel: [header] How to visit the world trade center [title] Take the official 9/11 tour to learn about the events and the memorial. [step] This is the most popular tour because it covers a broad overview of the events of the attack, the construction of the memorial, and the history of the world trade center. The tour guide will explain the symbolism of the memorial and how it relates to the past and future of the area.

Ending1: [title] Choose between a " public " memorial tour and " private " memorial tour. [step] Individual memorial tours are usually conducted by civilians, who do not try to interact with the memorial for a period of time. Ending2: [title] Get tickets to the memorial museum after completing the tours. [step] The museum is located on the main street in victoria peak. Ending3: [substeps] This tour is a 45-minute walking tour of only the memorial grounds. Pre-booking your tour isn't required unless you have specific time constraints or are making a reservation for a large group. Ending4: Look for the 12 month periods when the area is laid out for visitors. Let us be sure you learn about the future more quickly than any historical perspective.

Answer format: ending1/ending2/ending3/ending4