Indicate whether each of the following $C$# programming language identifiers is legal or illegal. If it is legal, indicate whether it is a conventional identifier for a class.

a$.$ electricBil$7$

b$.$ ElectricBill

g$.$ Ay$56$we

c$.$ Electric bil$$

h$.$ Theater$\_$Tickets

d$.$ Static

i$.212$AreaCode

e$.$ void

j$.$ heightInCentimeters

f$.$ #ssn

k$.$ Zip$23891$

Void