Section: English

1) For beginning climbers, that is any who have not already scaled several major mountains, Mount Everest seems too difficult to tackle.

What correction should be made to this sentence?

1. change the spelling of several to sevaral
2. change seems to seem
3. insert a comma after is
4. change Mount Everest to mount everest
5. no correction is necessary

The phrase "that is" represents a parenthetical thought, which requires commas on each side of it.