La Quinta Enterprises Limited manufactures beer using a formula that has been successfully kept secret for $100$ years. It wishes to employ a consultant to prepare a report on the manner in which all aspects of its manufacturing operations can be made more efficient. During the period of the consultancy, the consultant will have access to records containing the confidential. Which of the following actions should be recommended to La Quinta as the best course of action?

That the consultant posts a security bond

That it has the consultant sign a non$-$disclosure agreement prior to disclosing or making the confidential information available to him.

Nothing has to be done as the consultant cannot disclose any of this information and it does not have to be put in writing

That it has the consultant sign a non disclosure agreement at the end of the consultancy