What value always terminates a C$-$string?

$\text{'}\backslash 0\text{'}($character$)$

$\text{'}0\text{'}($character $0)$

$\text{'}$

$\text{'}($newline character$)$

EOF $($end of file$)$

$\text{'}\backslash$x$00\text{'}($character$)$