In which of these cases will a file called error.txt be created?

In which of these cases will a file called error.txt be created?
A . Running cat filename 1> errors.txt when there is no such file
B . Running cat filename 2> errors.txt when there is no such file
C . Running cat filename 1> errors.txt when there is such a file
D . Running cat filename 0> errors.txt when there is such a file

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Answer: B