Final answer:
Carbon dioxide (CO2) is a covalent compound, not a metallic or network compound.
Step-by-step explanation:
When determining the compound type for a formula, we need to consider the elements involved and their bonding characteristics.
a) Carbon dioxide (CO2) is a covalent compound. It consists of two nonmetals, carbon and oxygen, sharing electrons to form covalent bonds.
b) In the case of metallic network, we typically have a metal atom surrounded by a sea of delocalized electrons. However, the formula 'CO2' represents a covalent compound, not a metallic one.
c) Similarly, 'covalent' is the correct classification for CO2 since it forms covalent bonds.