Answer:
a. Staples used to bind magazines - Direct Material
The staples are integral to holding the magazines so is a direct material.
b. Wages of printing machine employees. - Direct Labor
The printing machine employees are directly related to the magazine's production as they print it.
c. Maintenance on printing machines. - Factory Overhead
This cost is not directly associated with the publishing of the magazine so is an overhead.
d. Paper used in the magazine. -Direct Material
Without paper, the magazine can not be published which makes it a direct material.