Which of the following statements are correct?
1. In a steel compound column section, the width will be smaller when they are placed face to face than when they are placed back to back.
2. In the design of steel compound columns the length of battens are normally longer than the lacings.
3. Lacings in a steel compound column are designed as slender compression members.
1
1 and 3 only
2
1 and 2 only
3
2 and 3 only
4
1, 2 and 3