Which sentence conveys the most conversational yet professional tone? The undersigned respectfully reminds affected individuals that employees desirous of changing their health plans must do so before November 1. The health plan deadline is Nov. 1! Change them while you can! Employees changing their health plans must do so before November 1. ) It's imperative for those employees who wish to make alterations to their health plans to do so by November 1.

The best option is: **Employees changing their health plans must do so before November 1.**<br /><br />This sentence is concise, clear, and uses professional language while still maintaining a conversational feel. It avoids overly formal phrasing (like "the undersigned" and "desirous of") and overly casual phrasing (like "Change them while you can!" and "It's imperative"). It directly addresses the employees concerned and provides the necessary information in a straightforward manner.<br />