Q. A reference frame attached to the earth :
(1) cannot be an inertial frame because the earth is revolving round the sun
(2) is an inertial frame by definition
(3) is an inertial frame because Newton's laws are applicable in this frame
(4) cannot be an inertial frame because the earth is rotating about its own axis

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Solution:

A rotating or revolving frame is accelerating and hence, non-inertial.