A landlord in Wisconsin receives two applications for a vacant apartment. Applicant A has a steady income from a full-time job. Applicant B has a lower income from part-time work but receives a government housing voucher that covers the majority of the rent, making their total financial resources sufficient. If the landlord rejects Applicant B solely because their income is from a housing voucher, what is the landlord's action considered under Wisconsin Fair Housing Law?
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A
A legal business decision based on the source of funds.
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B
Illegal discrimination based on lawful source of income.
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C
Legal, as long as the landlord doesn't accept any government assistance.
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D
Illegal only if the landlord has more than four rental units.