A.I. Explanation:

Option 1: "Discounts on early ticket purchases"

Explanation: While the text mentions early bird discounts for tickets, this is not the main attraction of TechFest 2024. The focus of the event is on showcasing technology, not on ticket pricing.

Option 2: "A focus on sustainable technology"

Explanation: Although sustainable tech solutions are mentioned as part of the exhibits, they are just one aspect of the broader theme of innovation and digital advancement. Therefore, this option does not capture the main attraction.

Option 3: "Showcasing the latest in innovation and digital advancement"

Explanation: This option accurately reflects the main theme of the text, which emphasizes that TechFest 2024 is a premier exhibition focused on the latest innovations and advancements in technology. The phrase 'showcasing the latest in innovation and digital advancement' is directly supported by the text.

Option 4: "The location of the event"

Explanation: The location of the Grand Exhibition Centre is mentioned, but it is not the main attraction of TechFest 2024. The primary focus is on the technology and innovations being showcased, making this option too narrow.