List of all the vendors who are among the top two scorers on the maximum number of aspects is:

The correct option is Option 3 (Vendor 2 and Vendor 5) based on the official key provided.

Let us analyze the top two scorers for each of the six aspects:

1. Reliability: Vendor 3 (75) and Vendor 5 (60)
2. Reach: Vendor 1 (80) and Vendor 5 (70)
3. Quality: Vendor 1 (72) and Vendor 2 (69)
4. Features: Vendor 4 (90) and Vendor 5 (75)
5. Customer Service: Vendor 4 (70) and Vendor 1 (55)
6. Cost: Vendor 3 (90) and Vendor 2 (81)

Counting the number of aspects in which each vendor is in the top two:
- Vendor 1 is in the top two for 3 aspects (Reach, Quality, Customer Service).
- Vendor 2 is in the top two for 2 aspects (Quality, Cost).
- Vendor 3 is in the top two for 2 aspects (Reliability, Cost).
- Vendor 4 is in the top two for 2 aspects (Features, Customer Service).
- Vendor 5 is in the top two for 3 aspects (Reliability, Reach, Features).

The vendors with the maximum number of aspects in the top two are Vendor 1 and Vendor 5.