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Which of the following strongly supports incurring the expense of having a patent agent searchy redivany novelty?

Select one:

a$.$ The opinion is required to establish both ingenuity and inventiveness.

b$.$ The date of earliest use becomes the disclosure date used for establishing novelty.

c$.$ Opinions are crucial to the grace period for filing the patent application.

d$.$ Ninety percent of all patents are for improvements to existing patented inventions.