'Headhunters' are firms that, for a fee, undertake to recruit for their clients personnel who are greatly needed yet hard to find. The clients, in turn, require that they be off-limits to headhunters whose services they buy; i. e. , head-hunters cannot raid one client s staff on behalf of other clients. Of the following, which would, if feasible, be the best strategy for a company to pursue if that company wanted both to use headhunters to fill a vacancy and, if successful in filling the vacancy, to reduce the risk of losing the newly hired employee to a competitor?