Quiz: Valid names of the variables

Select the variables which are named correctly.

1	$alpha
1	$ALPHA
1	$A-L-P-H-A
0	$ a name	You cannot have spaces in the name.
0	$-a-name-	The name cannot start or end with a hyphen.
1	$FirstName
1	$first_name
1	first_name
1	$last'name	A single quote can be a part of a name.
1	$Βητα
1	$Βήτα	Accented Greek letters are also fine!
0	$33	A name cannot start with a digit.
1	$AddressLine1
0	$AddressLine-1	A dash must be followed by an alphabetic character.
0	$2LineOfAddress	A name cannot start with a digit.
0	$)%^@!#	Total rubbish :-)
0	$"scalar"	A quote character is neither letter nor digit nor underscore.
1	$number-of-items
1	$numberofitems
1	$numberOfItems
0	$number--of--items	Two hyphens one after another are not OK.
1	$number__of__items

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