A structural element is subjected to pure shear of 80 N/mm2, as shown in the figure. The yield stresses both in tension and in compression are 240 N/mm2. According to the maximum normal stress theory, the factors of safety in tension and compression are, respectively,
1
2 and 2
2
2.5 and 2.5
3
3 and 3
4
4 and 4