A.Option D

B.Option A

C.Option B

D.Option C

A.open () is a function which returns an object that represents a physical file

B.open () requires a second argument

C.instd, outstd, errstd are the names of pre-opened streams

D.if invoking open () fails, an exception is raised

A.it outputs 2

B.it raises an exception

C.it outputs 0

D.it outputs 1