Choose the correct answer from the following statements regarding metabolic pathways and their regulatory mechanisms:

1. The citric acid cycle (Krebs cycle) generates the majority of ATP through direct substrate-level phosphorylation, primarily via the action of succinyl-CoA synthetase.
2. Fatty acid synthesis occurs in the cytosol, utilizing malonyl-CoA derived from acetyl-CoA, and is regulated by the enzyme acetyl-CoA carboxylase, which is activated by citrate.
3. The urea cycle is a cyclic metabolic pathway that incorporates ammonia and aspartate to synthesize urea, with argininosuccinate as a key intermediate.