Which of the following is a disadvantage of cloud storage?

Cloud storage indeed has the disadvantage of requiring reliable internet access for users to upload or retrieve their data. This reliance can be problematic in areas with poor connectivity or during instances of internet outages, making data inaccessible when it is needed most. Furthermore, users may experience slower upload/download speeds based on their internet connection, which can hinder efficiency, particularly when dealing with large files.

The other choices present considerations that may not universally apply as disadvantages of cloud storage. For example, many cloud storage providers invest heavily in security measures, making data security a strong point rather than a weakness, although concerns can still exist. Maintenance costs often fall on the service provider rather than the user, thus reducing the burden on individuals or businesses. Lastly, access to cloud storage services is generally broad; while there may be some limitations based on account type or user permissions, this is not inherent to the concept of cloud storage itself.