Sound is what type of wave (Check all that applies)

Transverse
Longitudinal
Electromagnetic
Mechanical

It's a longitudinal and mechanical wave. The the sound is transported parallel to the direction that the sound wave moves and require a medium to travel.

Explanation:

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

so easy. just google the electromagnetic waves and it’ll pop up.