Synergids of the polygonum type embryo sac are
Haploid
Diploid
Triploid
Polyploid
For pollinated ovary which is correct
Persistent nucellus in the seed is known as
Embryo sac consists of
$A$ : Filiform apparatus guides the pollen tube into the synergids.
$R$ : It is special cellular thickening at micropylar tip to secrete chemotropic stimulus.