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Why are both electrical and hydraulic systems are used in the same aircraft?

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Why are both electrical and hydraulic systems are used in the same aircraft?

(a) To generate more force

(b) Quick deflections

(c) As a fail safe

(d) Hydraulics for more force and electric for quick deflections

The question was asked by my school principal while I was bunking the class.

The question is from Fly-By-Wire Technology topic in section Fly by Wire Flight Control of Avionics

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Best answer
Right answer is (c) As a fail safe

The best I can explain: Most of the main actuators are electro-hydraulic, fully electric actuators are used as a fail safe for hydraulic actuators. They must be able to survive any two failures and carry on operating satisfactorily in order to meet the aircraft safety and integrity requirements.

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