[sv-bc] Clarification for `1 usage in unpacked array concatenation

In SV 1800-2009 concatenations could be used as source expressions for unpacked arrays (section 10.10). I have a query regarding usage of `1 in unpacked array concatenation. If the RTL has something like below

logic [3:0] A [0:0];
initial
begin
               A = {'1};
end

Does this mean that the value of A[0] after assignment will be "1111" or will it be "0001"?

Thanks & Regards
Rohit Goel

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