Which statement accurately distinguishes between substrate-level phosphorylation and oxidative phosphorylation?

Substrate-level phosphorylation occurs in the mitochondria only, while oxidative phosphorylation occurs in the cytoplasm.

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient.

Substrate-level phosphorylation relies on oxygen, while oxidative phosphorylation does not.

Both substrate-level and oxidative phosphorylation produce ATP using the same mechanism.