Which of the following correctly declares a variable of type float in java? Choose all that apply

$1.)$ a $=0\mathrm{.}0$f;

$2.)$ float $[]$ a $=$ new float $[3]$;

$3.)$none of these

$4.)$ float a $=$ new float$()$;

$5.)$a$=$ float$(3$f$)$;

$6.)$float$[]$ a $=0$f;

$7.)$float a $=0$f;