Select all lines that demonstrate unboxing.

$1$ Integer intValue $=$ Integer.valueOf$("1999")$;

$2$ Double myScore $=30\mathrm{.}2$;

$3$ int yourScore $=$ myScore.intValue$()$;

$4$ Character yourGrade $=\text{'}$A$\text{'}$;

$6$ char myGrade $=$ yourGrade;

Question $10$ options:

$6$

$1,3$

$3$

$1,2,4$

Double myScore $=30\mathrm{.}8$;

int yourScore $=$ myScore.intValue$()$;

System.out.println$($cost $+""+$ yourScore$)$;

Question $9$ options:

Error: incompatible types

$199930$

$199931$

$199930\mathrm{.}0$