Option 1 -> "suburb" refers to a residential area on the outskirts of a city, which doesn't fit the context of being at a point of transition.
Option 2 -> "cusp" means the verge or edge of something significant, fitting perfectly in the context.
Option 3 -> "cusp" (same as Option 2) means the verge or edge of something significant, fitting perfectly in the context.
Option 4 -> "rolling stones" doesn't appear in the passage and doesn't make sense in this context.
Hence, Option 3: cusp -> The phrase "on the cusp of" (found in the passage as "on the cusp of celebrating 25 years") means at the point of transition or on the verge of something significant. It perfectly captures the idea that AI has brought innovation and technology to the brink of remarkable advancement -> correct