Select one option which shows the output of line 5 from the algorithm shown below.
1 devices ← ['Router', 'Switch', 'Hub', 'Bridge']
2 dev1 ← 'Firewall'
3 dev2 ← 'Gateway'
4 OUTPUT dev1
5 OUTPUT LEN(devices)
6 var ← SUBSTRING(2, 4, dev2)
7 OUTPUT var
3
4
8
10