Answer:
3. cleaning the windows on a tall building
4. It is dangerous because you are only hooked up to a harness that is 100 of feet in the air at free fall. The harness might not be hooked all the way causing you to fall, and possibly dyeing. You can make sure your harness is tight and secure, if your afraid of heights don't do it, be carful, stay calm, or just find a different job.
Step-by-step explanation: