A.None

B.True

C.0

D.False

A.Option C

B.Option A

C.Option B

D.Option D

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

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

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

D.open () requires a second argument

A.ch = s. input(1)

B.ch = s. read(l)

C.ch = read(s, 1)

D.ch = input(s, 1)

A.a, b, c = a, b, c

B.a, b, c = c, a, b

C.c, b, a = a, c, b

D.c, b, a = b, a, c