In modern browsers, which attribute of an input element prevents the form from being submitted if the field is left blank??

________ rearrange(s) objects to use disk space more efficiently, thus releasing the now unused space to be used again

A) Backups B) Reports C) Queries D) Compacting

When the host is using TCP, why does the transport layer initiate a process to create a connec tion with the destination?

What will be an ideal response?