Answer:
Anions
Step-by-step explanation:
Anions : Anions are defined as the atoms or the radicals. Atoms that have become negatively charged by gaining extra electrons are anions. For example, bromide ion (Br⁻), chloride ion (Cl⁻).
Anodes : The positively charged electrode by which an electron leave a device is called an anode.
Cations : They are the positively charged particle. For example silver ion (Ag⁺).
Cathodes : The negatively charged electrode by which an electron enter an device is called an cathodes.
Hence, the correct option is (a) " anions ".