Question $1(10$ points$)$ Which of the following are valid variable declarations: $($Select ALL that are correct$)$ int a$=7$; long b$=-2$; char c$="$Y$"$; float d$=17\mathrm{.}2$f; double e$=9$; Java: boolean f$=0$; C#: bool f$=0$; Java: boolean g$=$true; C#: bool g$=$true;Question $2(10$ points$)$ What is the output of the following statements: $//$ Java: String s$="$Hi$"$; for$($int i$=0$;i$<3$;i$++)\{$ System.out.print$("$S$"+$s$)$; $\}//$C#: string s$="$Hi$"$; for$($int i$=0$;i$<3$;i$++)\{$ Console.Write$("$S$"+$s$)$; $\}$ Hi HiHiHi SHISHISHI SHISHIQuestion $3(10$ points$)$ Which of the following blocks of code will successfully ask a user for a number, multiply that number by $2,$ and print the result Java and C# Code Java C# import java.util.Scanner; System.out.println$("$Enter a number to be doubled: $")$; Console.WriteLine$("$Enter a number to be doubled :$")$; Scanner myscanner $=$ new Scanner $($System$.$in$)$; string num$=$Console.ReadLine$()$; num$=2$; String num$=$myscanner. NextLine$()$; num$=2$; Console.WriteLine$("$Your number doubled is $"+$num$)$ System.out.println$("$Your number doubled is $"+$num$)$; Java and C# Code Java C# import java.util.Scanner; Console.WriteLine$("$Enter a number to be doubled :$")$; System.out.println$("$Enter a number to be doubled: $")$; string answer$=$Console.ReadLine$()$; Scanner myscanner $=$ new Scanner $($System$.$in$)$; int num$=$Int$32.$Parse $($answer$)$; int num$=$myscanner.nextInt $()$; num$*=2$; num$=2$; Console.WriteLine$("$Your number doubled is $"+$num$)$; System.out.println$("$Your number doubled is $"+$num$)$; Java and C# Code Java C# import java.util.Scanner; string answer int num; Console.WriteLine$("$Enter a number to be doubled :$")$; System.out.println$("$Enter a number to be doubled: $")$; Console.ReadLine $($answer$)$; scanner myscanner $=$ new Scanner $($System$.$in$)$; int num$=$Int$32.$Parse$($answer$)$; myscanner.nextInt $($num$)$; num$=2$; num$=2$; Console.WriteLine$("$Your number doubled is $"+$num$)$; System.out.println$("$Your number doubled is $"+$num$)$;