How does glutamate contribute to both ammonium production and aspartate formation in the urea cycle?

Glutamate is converted into glutamine, which then forms aspartate.

Glutamate is used to synthesize ATP, which is then used to form aspartate.

Glutamate is directly converted into urea and aspartate.

Glutamate provides ammonium by being converted to alpha-ketoglutarate and forms aspartate by donating an amino group to oxaloacetate.