As you think about your experience at the last airport security screening, you wonder which of the tasks that you saw the officers do at the security check were waste, which were non-value-added work, and which were value-added work. The tasks that you observed included officers doing the following: 

(a) Officers checking IDs, 

(b) Officers telling passengers to take off their shoes, 

(c) Officers moving bins back to the beginning of the X-ray machines, 

(d) Officers looking at the screen of the X-ray machine, 

(e) Officers putting bags in the Xray machine for a second time in case they previously contained fluids, 

(f) Officers waiting for a passenger to arrive.

Identify each of the above activities as waste, value-added work, or non-value-added work.