Answer: Security
Step-by-step explanation: While Public Clouds, from credible providers, are more secure than most SME IT infrastructures, there is a trade-off. First, you can only customize security factors at the operating system level - security at the physical level is under the purview of your supplier. Second, Public Cloud servers are, by default, visible internet-wide. This has been shown to lead to increased levels of remote scanning for vulnerabilities. Securing your server at the OS level is therefore essential.