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

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

C.open () requires a second argument

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

A.It raises an exception

B.It outputs True

C.It outputs False

D.It outputs nothing

A.>>

B.- -

C.<<

D.++

A.it outputs True

B.it raises an exception

C.it outputs nothing

D.it outputs False

A.it outputs 3

B.it outputs 1

C.the code is erroneous and it will not execute

D.it outputs 2