Microprocessor
Assertion (A): Negative values of incremental operator in DO loop are allowed in Fortran 77 but not in earlier versions of Fortran. Reason (R): Fortran 77 has better array facilities than earlier versions of Fortran.

A is wrong R is correct
Both A and R are correct but R is not correct explanation of A
A is correct R is wrong
Both A and R are correct and R is correct explanation of A

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