Concept:The word “Ubiquitus” is incorrectly spelled; the correct spelling is “Ubiquitous,” meaning present everywhere.Explanation:Check each option for spelling errors. Option A: “Ubiquitous” is spelled correctly. Option B: “interference” is correct. Option C: “interrupt” is correct. Option D: “Ubiquitus” is wrong – it should be “Ubiquitous”. Thus, the misspelt word is “Ubiquitus”.Answer:Option D – Ubiquitus