2. A series of interrupts of different hardware priority levels occurs in the following time sequence, with times in seconds:

timeinterrupt
1IRQ1
3IRQ3
6IRQ4
9IRQ2

Higher numbers indicate more immediate priority (i.e. aside from zero, one is the lowest priority). Assume that each interrupt takes four seconds of CPU time to process. Complete the following chart indicating at which priority level the CPU will be running during the indicated second.

timepriority
00
11
21
33
43
53
64
74
84
94
103
112
122
132
142
151
161
170
180


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