How is a toggle switch different from a repressilator?

A) A repressilator oscillates whereas a toggle switch is bistable.
B) Repressilators encode repressors (e.g.LacI),but toggle switches do not.
C) A repressilator requires a control molecule (e.g.IPTG),whereas a toggle switch does not.
D) Toggle switches encode repressors (e.g.LacI),but repressilators do not.
E) Anhydrotetracycline is an effective regulatory of repressilators,but not of toggle switches.