Introduction of a drug directly into the respiratory tract is a form of administration.
a. topical
c. enteral
b. inhalation
d. parenteral

B) Inhalation, breathing something in will have it enter your system the quickest 

enteral, through eating or by mouth
topical, on the skin
parenteral, both trough eating/mouth or yer um... bum 

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

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