Quiz 3: Concatenating strings again

Which lines are correct Raku code to concatenate strings?

0	'alpha' + 'beta'	A `+` does not concatenate strings.
0	'alpha' . 'beta'	Neither does a `.`.
1	'alpha' ~ 'beta'	Only the `~` is a string concatenation operator.
0	'alpha' ~~ 'beta'	One tilda is enough. This line is syntactically correct, but it does not concatenate the strings.
0	α ~ β	Strings need to be quoted.
1	'α' ~ 'β'

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