What happens to a static route entry in a routing table when the outgoing interface is not available?

The route is removed from the table.
The router polls neighbors for a replacement route.
The route remains in the table because it was defined as static.
The router redirects the static route to compensate for the loss of the next hop device.

ccna exploration 2 chapter 2 Exam Question And Answers 

What happens to a static route entry in a routing table when the outgoing interface is not available?