IS: 1343 - 1980 limits the minimum characteristics strength

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IS: 1343 - 1980 limits the minimum characteristics strength of prestressed concrete for post tensioned works and pretension work as

1. 25 MPa, 30 MPa respectively
2. 25 MPa, 35 MPa respectively
3. 30 MPa, 35 MPa respectively
4. 30 MPa, 40 MPa respectively

Correct Option: D

30 MPa, 40 MPa respectively