$9.$ Indicate whether each of the following people need to attend an IATA Training Seminar every two years:

a$.$ John Wang, a secretary who makes an appointment with FedEx to pick up packages of biological

materials. yes or no

b$.$ Casey McCarthy, an office secretary who prepares the required hazardous materials description on

a shipping paper at the direction of another, item by item. yes or no

c$.$ The Christo labs send out a similar package containing a category A biological substances every

month. Laura Chen prints out a Dangerous Goods Declaration form and signs it$.$ yes or no