Consider the following java program

$```$

package exams;

public oless Exambetails &

public atatie void main$($StEing$[]$ arga$)($

StudentReaulea astudent $=$ nev StudentRearLta$()$ ;

String sName $=$ astudent.fullNane$("$Badre Soularni"$)$ s

$tring exean $=$ astuclent,exanName $("$V$1")$ ;

String acore $=$ aSeudent.exanScore $(90)$:

String grade $=$ ascudent. exam$0$xade $(90)$ :

Syatens. O&t$-$print in$($ sNome $)$;

Syarem. obt.printin$($ exam $)$;

System. obl.printin$($ scoke $)$:

Syscew. out $=$ printin$($ grade $)$y

$3$

$3$

$```$

$1$

$```$

packnge exarar:

prbize olass stodentBesults t

pciwase acxioy Fall$\_$Foses

privare Sering Eram$\_$Knese;

pulwate acring Enas$\_$seoke.

prsvase Atring Erax$\_$Grader

Stwelemthesults $[)\{$

rall$\_$Kenen $=$ "Tho Mone Gsven";

Enas$\_$Nuse $=$ "Uaknova":

Eras$\_3$pore $="$Ho $3$core";

Eraz$\_$Grade $=$ "Trkmova":

I

$```$

$```$

Fuli$\_$Mane $=$ altase?

return Fuit$\_$Focet;

B$($ting exandiane $($ing exanCode$)\{$

$4\%($erancods$.$ Eganla$("$vD$"))$

Enan$\_$Nase $=$ "Tliswol Basto $,$MeT"y

$\backslash$

elae if $($exncaCode$.$equala$["$N$\backslash ")$ &

Zxan$\_$Mane $="3$wva":

$\backslash$gamma

$```$

$```$

ExHs$\_$BHne $=+$CF $,$SOLT'$1$

I

else it lexunCode$-$equas$($s$)("$PR$"$i$)\{$

Erax$\_$Nuse $=$ "rap";

$?$

else $\backslash$

Txnn$\_$Mlun $="$Ks Zxus Aelectad";

$>$

return Exan$\_$Mane$1$

$```$

$```$

String examScare $\{$int aseoge$)$f

Eran$\_$geoce $=$ asooce $+*$ out of $100*,$

retura Exon$\_$Fcore;

$?$

$8$trim$/$manskadg$\backslash$int asoocel $\backslash$

Eran$\_($enSi $=$ this. getGrnde $($sGleore$)$;

retura Exas$\_$Gcada:

$)$

privare String $\%$etirade $($int afoore$)($

$2$

$3$tring exnanGEade $=**$;

if $($nScore $>=06\mathrm{.}4$ atcore

exaenGrade $="$F$"$ I

$1$

else it $($aScore $>=6066$ ascore

extenGrade $="0-$ ;

$1$

elae it $($aScore $>=7066$ aScore

exnanGrade $="$C$"$ ;

$\}$

else it $($aScore $>=$ $$066$ abcore

exnagrade $="$B$\text{'}$;

$1$

else it $($aScore $>=90)\{$

exnanGrade $="$A$"$;

$\}$

retura "Graste in $"+$ exanGrade;

$)$

$\backslash$

$```$

a$)-$ What is the output of the program.

b$)-$ What is the need of the method examGrade