Final answer:
Crosstalk noise can indeed occur in both guided and unguided communication channels, affecting signals transmitted across different circuits or systems.
Step-by-step explanation:
The statement that crosstalk noise can occur in either guided or unguided communication channels is true. Crosstalk refers to any phenomenon by which a signal transmitted on one circuit or channel creates an undesired effect in another circuit or channel. It can affect both guided media, such as copper wires and fiber optics, where wires are physically close to each other, and unguided media, such as wireless communication systems where electromagnetic waves can interfere with each other.