According to I.B.R., when the thickness of the boiler shell () is less than 8 mm, then the diameter of the rivet hole () is obtained by

• A. equating tearing resistance of the plate to the shearing resistance of the rivets
• B. equating tearing resistance of the plate to the crushing resistance of the rivets
• C. equating shearing resistance to the crushing resistance of the rivets
• D. none of the above