Which of the following sets of compounds are all four-carbon dicarboxylic acids involved in the citric acid cycle?

citrate, isocitrate, succinate, and fumarate

oxaloacetate, malate, fumarate, and succinate

acetyl-CoA, citrate, isocitrate, and α-ketoglutarate

succinyl-CoA, α-ketoglutarate, malate, oxaloacetate