UnitedHealthcare is offering certain employees in its benefits operations unit the option to accept buyouts if they quit by March 3, following a tumultuous year for the insurance giant, CNBC has learned. Those who don’t accept the offer will continue in either their current role or a comparable position, two people familiar with the matter told CNBC. If the company does not meet a resignation quota through buyouts, it will lay off employees, the people said, citing an internal resource site.