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Which of the following is the correct statement regarding abrasive wheel machinery guards meeting the design specifications of the American National Standard Safety Code for the Use, Care, and Protection of Abrasive Wheels, ANSI B7.1-1970?
a) They are optional for industrial use.
b) They must comply with ANSI B7.1-1970.
c) They are only necessary for certain types of abrasive wheels.
d) Their design specifications are outdated and not recommended.