What would be the best way to start a cover letter with the following information?

Applying for a job. Instruction say to submit resume to “Jane, HR Department, CES, 123 Sesame street.”

So do I start with Dear Jane or Dear HR, or To Whom It May Concern?

The “To Whom” doesn’t seem right, because I know who the whom is, but there is no last name.

“Dear Jane,” just sounds too casually familiar.

“Dear HR” sounds dumb because they done told me who to send it to, and it wasn’t the whole HR department.

What do you think?