Select all the variable names that are syntactically correct from the list below.

Note: Here, the style of the variable names will not be checked $($i$.$e$.$ having a meaningful name$),$ but only checking that Python will not give an error.

Question $8$Select one or more:

this$\_$is$\_$a$\_$very$\_$long$\_$variable$\_$name

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hurrah

G$\_$B$\_$D

$123$abc

abc$123$

a$1$b$2$c$3$

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a$1$

this$\_$is$\_$a$\_$very$\_$long$\_$variable$\_$name!

some$\_$variable