In the context of electric vehicle batteries, consider the following elements:
I. Cobalt
II. Graphite
III. Lithium
IV. Nickel
How many of the above usually make up battery cathodes?

Correct Option: Only three

Only three (Cobalt, Lithium, and Nickel) are used in electric vehicle battery cathodes. Graphite (element II) is famously used to manufacture battery *anodes*, not cathodes. Cobalt, nickel, and lithium (along with manganese or aluminum) form the active layered transition metal oxide structures comprising modern Lithium-ion battery cathodes.