Which of the following are valid variable declarations:

$($Select ALL that are valid$)$

Question $1$ options:

int a$=1102$;

long b$=1$;

Java:

String c$=7$;

C#:

string c$=7$;

Java:

String d$=""$;

C#:

string d$=""$;

Java:

String e$="$a$"+"$b$"+7$;

C#:

string e$="$a$"+"$b$"+7$;