If the filtration system does not work, how can
someone use the document to solve the problem?
by repeating the installation steps described in the
document and referring to the diagram
by installing the filter in a different order than the
one in the document
by referring to the diagram to come up with
another way to install the filter
by installing the heater first to see if that allows the
filter to function

the answer is A

If the filtration system does not work, someone can use the document to solve the problem "by repeating the installation steps described in the  document and referring to the diagram".

Option A

Explanation:

Every product is launched in market with it guideline book or pamphlet. It consist basically rest of the important details which is required to access the product with more ease and satisfaction. Electrical appliances or products have installation step book, for the cases when one is unaware about the installation of software or calibration of system. If one face barriers in installation than firstly steps should be repeated as given in book rather than concluding that system is damaged.

answer: #1 is (a) however

explanation: