Quiz — Return type

There is a function:

sub add(Int $x, Int $y) returns Int {
    $x + $y
}

Check which of the following assignments will work.

1	my $a = add(4, 6);	Assigning to an untyped variable works.
0	my Rat $b = add(5, 6);	An `Int` value cannot be assigned to a `Rat` typed variable.
1	my Int $c = add(7, 8);
0	my Num $d = add(9, 10);
1	my Str $e = add(9, 10).Str;	Explicit type conversion helps.
0	my Str $f = add(9, 10);

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