What does this shell script do?

FOO= /tmp/ foo
if [   !  –d  $FOO   ];   then
mkdir $FOO
fi

• Creates /tmp/foo if it does not exist
• Makes the /tmp/foo directory if a file by that name exists
• Outputs a message to the screen
• Creates /tmp/foo and raises an error if there is a problem
• Nothing, since there is a problem with the conditions in the if statement