The technician who performs sealed-system service on small appliances must have Type I or Universal certification. Thus, the correct option is B.
A sealed-system service may be defined as those services which are performed by the technician that can be sealed by the product of the company with the mark of OK tested.
Type I certification delivers to those technicians who service, maintain and repair small appliances that incorporate CFCs, HCFCs, or HFCs.
Technicians can hold either Type I or Universal certification which includes Type I to service appliances sheathed under Section 608.
Therefore, it is well described above.
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