Quiz 2 — Variables as named parameters

Here is the same function as in the previous quiz:

sub f(:$a, :$b) {
    $a - $b
}

You also have three variables in the program:

my $a = 1;
my $b = 2;
my $c = 3;

Mark all the valid ways to call the function and pass two of the three variables to it.

1	f(a => $a, b => $b)
1	f(a => $c, b => $c)
0	f($a, $b)	Positional arguments are passed here instead of the named ones.
1	f(:$a, :$b)
0	f($:a, $:b)	Not a valid Raku syntax.
0	f(:$b, :$c)	No named parameter `c`.
0	f(:$a, c => $c)	No named parameter `c`.
1	f(:$a, b => $c)
1	f(:$a, :b($c))	Same as above.
1	f(:a($a), :b($c))	Also fine, while a bit redundant.

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