A steel beam with the cross-section shown is subjected to a moment of 50 kNm. Calculate the highest bending stress in the beam cross-section. Select one: A. $sigma_{max} = 179.94 ext{ MPa}$ B. $sigma_{max} = 89.95 ext{ MPa}$ C. $sigma_{max} = 79.1 ext{ MPa}$ D. $sigma_{max} = 359.8 ext{ MPa}$
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