Assertion (A) : Short wave bands are used for transmission of radio waves to a large distance. Reason (R) : Short waves are reflected by ionosphere.

Both (A) and (R) are true and (R) is the correct explanation of (A). Both (A) and (R) are true but(R) is NOT the correct explanation of (A). (A) is true but (R) is false. Both (A) and (R) are false.

(A) is true but (R) is false.

Long waves are reflected by ionosphere.