Thanks for the detailed explanation Karen!
But your case is slightly different. Since your "postgraduate certificate" has been recognized by WES as a "certificate"
In my case the Canadian equivalency for the two year M.Sc. program is "one year graduate study"
So I really don't know if we can choose 'two or more post secondary certificates'
I am being extra careful here coz in case I get an ITA my application should not be rejected becoz of this mismatch between the ECA summary and the information :'(