Correct answer: A. Applying a new digital billing method across the whole network
Explanation: Direct answer: Option A, applying a new digital billing method across the whole network. A pilot test is a small, controlled trial conducted before full implementation. It is especially useful when a change affects many branches, employees, customers, records, or systems. Step by step: the company designs the digital billing method; it tests it in one limited location or group; it observes errors, training needs, internet or software problems, customer confusion, and control gaps; it corrects the method; only then does it expand it across the network. Option A is correct because a network-wide change could create large losses if an untested method fails. Option B, keeping a pen on one desk, is trivial and has no meaningful implementation risk. Option C, putting up a calendar, is similarly simple and does not need a process pilot. Option D, changing the owner’s photograph, is a minor personal or display action, not a complex organisational method. A pilot does not guarantee perfection, but it reduces avoidable large-scale errors. Memory cue: test small before changing everything.