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Transistors are known as being solid-state. This means ____.

A transistors have no moving parts and all of their electricity exists in their material
Unlike vacuum tubes, relays, switches, hard drives, etc. that have moving parts, transistors have no moving parts and store their electrical charge in a solid material, usually silicon.
B transistors never change state once set
C transistors are very reliable and are generally "solid"
D transistors carry no state information between charges