Writing for Business – Data is or data are

Once all the data ______ in, we can set traps to identify the zombie’s controller.
a. is
b. are
Which is correct?

Answer: Both answers are correct.

Source: Oxford Dictionary
Strictly speaking, data is the plural of datum, and should be used with a plural verb (like facts). However, there has been a growing tendency to use it as an equivalent to the uncountable noun information, followed by a singular verb. This is now regarded as generally acceptable in American use, and in the context of information technology. The traditional usage is still preferable, at least in Britain, but it may soon become a lost cause.