Licensing requirements for maintenance workers is covered by health codes. Thus option C is correct.
What is health code ?
It is a set of standards which was established and enforced by government for different health related issues.
The objective was to maintain a balance between disease control and work resumption.
It is a dynamic code used on the mobile phone app by showing three colors such as green, red and yellow.
Green color refers digital pass that the people can move around the places by using public transport, while red or yellow refers to the people get in touch with any infection informed to be quarantine immediately.
Thus option C is correct.
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