Match the following types of formworks with their minimum required striking period.
a.

1624 hours

1.

Soffit formwork to slabs

b.

7 days

2.

Props to beams and arches spanning up to 6 m

c.

14 days

3.

Vertical formwork to columns, walls, and beams

d.

3 days

4.

Props for slabs spanning up to 4.5 m

1. a  3, b  2, c  4, d  1
2. a  4, b  3, c  2, d  1
3.
a  3, b  4, c  2, d  1
4. a  3, b  4, c  1, d  2