Amedical transport helicopter is incoming and you are responsible for setting up the landing zone (lz). you should: select one:

a. use weighted cones to mark all four corners of the lz.

b. use yellow caution tape to mark of the lz perimeter.

c. place four flares 100 feet apart in an "x" pattern.

d. ask bystanders to stand at all four corners of the lz.