Final answer:
The spray bottle should be labeled with a permanent sticker that has the word "Sanitizer" printed on it to ensure safety and clarity.
Step-by-step explanation:
The correct answer is for Mike to put a sticker on the spray bottle that has the word "Sanitizer" printed on it so that it is permanent. This is important for safety reasons as well as to ensure that others know what the bottle contains. While it may be true that the chemical color is red, it is still necessary to label the bottle properly to avoid any confusion or accidents. Writing "Sanitizer" with a nonpermanent marker might smudge or fade over time, making the label unclear. Therefore, a permanent sticker is the best solution.
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