3. Where the employer is a subcontractor who has infringed this Directive and where the main contractor and any intermediate subcontractor have not undertaken due diligence obligations as defined by national law, the main contractor and any intermediate subcontractor may:
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(a)
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be subject to the sanctions referred to in paragraph 1;
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(b)
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in addition to or in place of the employer, be liable to pay any compensation due to the seasonal worker in accordance with paragraph 2;
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(c)
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in addition to or in place of the employer, be liable to pay any back payments due to the seasonal worker under national law.
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Member States may provide for more stringent liability rules under national law.