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Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Product of Pressure ( P ) and time ( t ) has the same dimension as that of coefficient of viscosity. Reason R : Coefficient of viscosity = gradient Velocity Force Choose the correct answer from the options given below.

1. Both A and R true, and R is correct explanation of A .
2. Both A and R are true but R is NOT the correct explanation of A .
3. A is true but R is false.
4. A is false but R is true.

Correct answer: A is true but R is false.

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