The following is a list of activities that occur for a company that sells many different types of products. Please classify each as either unit-level (U), batch level (B), product level (P), or organization sustaining activity (O).
a. Packing labor wages
b. Materials-handling labor wages
c. Part administrators' salaries
d. Plant management salaries
e. Production scheduling staff salaries
f. Cost of serving production equipment, based on hours used
g. Property taxes of a plant site
h. Production expediters' salaries
i. Insurance for plant facility
j. Plant security
k. Production workers' training
l. Cost of electricity to run production equipment