Which of the following weather phenomena meet the criteria for being considered a tornado?
a.A dust devil that forms on a hot, clear day
b.A supercell thunderstorm that produces a violently rotating funnel cloud with no visible circulation on the ground
c.A landspout produced by an ordinary cell thunderstorm with a rotating condesation funnel reaching the ground
d.A supercell thunderstorm that produces an area of circulation that is visible on the ground as flying dust and debris
e.A thunderstorm that moves over a lake and produces an area of circulation that touches the water's surface