A regulation excerpt states: 'No person may operate an aircraft in controlled airspace under IFR unless that person has filed an IFR flight plan and received an appropriate ATC clearance.' A pilot is flying IFR in Class E airspace without having filed a flight plan. What has the pilot violated?
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A
Only an advisory rule, since Class E is uncontrolled
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B
A mandatory regulation requiring both a filed plan and ATC clearance for IFR in controlled airspace
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C
Only the clearance requirement, since Class E flight plans are optional
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D
No regulation, as IFR flight plans are only required in Class B airspace