Ever since the dawn of computing, there has been a strong distinction between this machine and that machine. If the data was on this machine, you could not access it from that machine, unless you explicitly transferred it first. Similarly, even if you had the data, you could not use it unless you had the right software installed. To solve the issue, which of the following services can not be used?

Question $3$ options:

Dropbox

Google Drive

Pendrive

SkyDrive