A beam rquires a section modulus of 420 cm3, which of the following cross-section is most suitable for this purpose.
1
ILSB 200 @ 0.41 kN/m, Zxx = 500 cm3
2
ISLB 250 @ 0.37 kN/m, Zxx = 550 cm3
3
ISWB 600 @ 1.47 kN/m, Zxx = 6060 cm3
4
ISHB 300 @ 1.1 kN/m, Zxx = 3060 cm3