How does fumarate link the urea cycle to the citric acid cycle?

Fumarate is used to synthesize ATP in the citric acid cycle.

Fumarate is converted into argininosuccinate in the citric acid cycle.

Fumarate is directly converted into glucose in the citric acid cycle.

Fumarate produced in the urea cycle enters the citric acid cycle, where it is converted to malate and then oxaloacetate.