What’s the difference between the two statements

Question

1. Aeronautical information is provided by means of written or verbal.

2. Aeronautical information is provided by means of written, verbal.

Answer 1

Something is missing in both sentences near the end to qualify what ...You might say...Aeronautical information is provided verbally or in writing. (#1. provided by written or verbal what? #2. two words separated by a comma do not make a listing , which includes three or more things). #1 also could state...Aeronautical information is emphasized through (or via) written or verbal statements.Just two suggestions...