Why should programmers avoid making the following comparison with double $x?$

$0$

$x=0\mathrm{.}3$

Because doubles should not be compared with integers

Because variables should not be compared with literals

Because $0\mathrm{.}3$ may not be exactly represented as $0\mathrm{.}3$

Because the $0\mathrm{.}3$ should come first: $0\mathrm{.}3==x$