Option C is $4.95/month or $36.00/year as a Forwarded service.
Option C is $3.95/month or $24.00/year added to Residential

Actually that is the Forwarded versus Virtual(Non-toll free) Number.
Dedicated 2nd line thru Beta is a free option to make the two lines work independently.
Otherwise they are "cloned" lines.

Hanging a second cheap phone off the 2nd line would be one way to hear it ring. You can set the CID to show your new primary line when you dial from that line, so you don't untrain people.

I would not broadcast on a VM your new phone number. The one's you really care about, you will surely tell!