Which command will extract and uncompress the file?

Dave has a compressed tar archive named pics.tar.Z Dave needs to uncompress and extract the
data from this file. Which command will extract and uncompress the file?

A.
uncompress pics.tar.Z;tar xvf pics.tar

B.
zcat -c pics.tar.Z | tar xvf -C. bunzip2 pics.tar.Z;tar xvf pics.tar