Which of the following sentences has no punctuation, spelling, or grammar mistakes?
When you are rock climbing you are faced with terrain that could possibly have falling rocks, or branches.
When you are rock climbing, you are faced with terrain, that could possibly have falling rocks, or branches.
When you are rock climbing you are faced with terrain that could possibly have falling rocks or branches.
When you are rock climbing, you are faced with terrain that could possibly have falling rocks or branches.