(a) Fixed Place of Business. Every person engaging in, conducting, managing or carrying on, at a fixed location, a business for which a permit is required shall keep such permit posted and exhibited in some conspicuous part of the place of business.
(b) No Fixed Place of Business. Every person engaging in, conducting, managing or carrying on, at other than a fixed location, a business for which a permit is required shall carry such permit with him at all times while engaging in said business.