How do you write quotation marks

1) 'foo'
2) "foo"
3) ``foo'' (faggot)
4) other

You're all `faggots'
Option 3 is for oldies.
People that still check for FORTRAN 95 compilers in their configs and checkign for obscure bullshit so my application supports VT100 and friends every fucked up platform etc
``GTFO''