Deleting certain rows with partially duplicate values

If two rows have matching values in column A and in column B, I need to delete the row with the value RED. For example:

A        B        C     D1    March-1st    2    RED1    March-1st    3   GREEN3    March-5th    8   GREEN6    March-8th    4   GREEN 2    April-3rd    5    RED2    April-3rd    0   GREEN

Here I would need to delete row 1 and 5 because they have the value RED in column D while they share values in column A and B with another row.

Here's what I have:

[G,GID] = findgroups(T.A,T.B);is_red = strcmp(T.D,"RED");delete_row = false(size(T,1),1);for ii = 1:numel(GID)    idx = G == GID{ii};    if nnz(idx) == 1        continue    end    delete_row(idx & is_red) = true;endT(delete_row,:) = []

The error I am receiving says:

Error using tabular/parenDeleteRow index exceeds table dimensions.Error in ParserT(delete_row,:) = []