Final answer:
In guitar tablature, scales are notated from left to right with a sequence of numbers representing frets, while chords are notated with numbers aligned vertically, indicating that these notes are to be strummed simultaneously. The correct way scales and chords are notated differently in tab is that scales are written horizontally for individual note play, and chords are stacked vertically for simultaneous play.
Step-by-step explanation:
When reading guitar tablature (tab), scales and chords are notated differently to indicate how they should be played on the guitar. Scales are typically noted from left to right, with each number representing the fret that should be played on a string; the numbers are arranged in sequence to indicate the order in which the notes of the scale should be played. In contrast, chords are indicated with numbers aligned vertically across the strings. When you see multiple numbers stacked on top of each other in a vertical line, this means you should play these notes simultaneously to form a chord.
The correct answer to the question of how scales and chords are notated differently in tab is: 2) Scales are notated from left to right, while chords are aligned vertically. Scales do indeed involve multiple numbers on the lines, indicating the order of notes, but chords do too - just in a different format. The idea that scales use fret numbers and chords use finger numbers, or vice versa, is incorrect. Both use fret numbers to indicate where to place fingers on the fretboard.