NEC ECC: Option C - Off Site Fabrication - Sub-Contract Fee or Direct Fee?

If a Contractor under an Option C issues an NEC3 Supply Contract for some off site fabrication does this attract the sub-contract fee % or the direct fee % in their applications?

The off site fabricator would fall as a subcontractor under clause 11.2 (17) since it is constructing part of the works. The Subcontract Fee % would therefore be applicable.