which materials can be used to make fiber optic strands?\no metal and glass\no glass and plastic\no plastic…

Brief Explanations:

Fiber - optic strands are commonly made from glass (silica - based glass is typical) or plastic materials due to their ability to transmit light signals efficiently. Metals are electrical conductors and not used for light - transmission in fiber - optics, and ceramics are not the main materials for fiber - optic strands.

Answer:

glass and plastic