Select one option which shows how many times the subroutine BOOT_SERVER would be called if the user input is 'medium' in Figure 1.

Figure 1

1      traffic_level ← USERINPUT
2      IF traffic_level = 'high' THEN
3          servers ← 5
4      ELSE IF traffic_level = 'medium' THEN
5          servers ← 3
6      ELSE
7          servers ← 1
8      ENDIF
9      FOR index ← 1 TO servers + 2
10         IF index MOD 3 = 0 THEN
11             OUTPUT 'skipping'
12         ELSE
13             BOOT_SERVER('node')
14         ENDIF
15     ENDFOR