How does pyruvate's role as an electron acceptor in fermentation affect other metabolic pathways?

Pyruvate donates electrons to NADH, regenerating NAD+ and enhancing the use of other metabolic pathways.

Pyruvate accepts electrons from NAD+, regenerating NADH and limiting the use of other metabolic pathways.

Pyruvate donates electrons to NAD+, regenerating NADH and enhancing the use of other metabolic pathways.

Pyruvate accepts electrons from NADH, regenerating NAD+ and limiting the use of other metabolic pathways.