Which one of the following statements is correct ?

The Director General of the Central Industrial Security Force may direct the members of his Force to provide technical consultancy services relating to security to an industrial establishment in the private sector, on a request received in this behalf from the Managing Director concerned.

The Director General of the Central Industrial Security Force may direct the members of his Force to provide technical consultancy services relating to security to an industrial establishment in the private sector only if such establishment is executing a government contract.

The Director General of the Central Industrial Security Force may allow the members of the Force to provide technical consultancy services relating to security to an industrial establishment in the private sector only in their individual capacities.

Technical consultancy services can be rendered by the Central Industrial Security Force only when it has idle capacity.