All licenses must be kept and posted in the following manner:

(a) Any licensee transacting and carrying on business at a fixed place of business in the city shall keep the license posted in a conspicuous place upon the premises where such business is carried on.

(b) Any licensee transacting and carrying on business but not operating at a fixed place of business in the city shall keep the license upon his person at all times while transacting and carrying on such business.

(c) Any licensee to whom a license has been issued, which license is determined by the number of vehicles used by such licensee in the conduct of his business in this city, shall prominently display within each such vehicle a sticker, device, sign or license facsimile used by the finance officer for identifying such business. (Ord. No. 1078, § 2.60.)