<prompt> Subtelomeric rearrangement of genes is frequently associated wih mental retardation. All of the following techniques can be used to diagnose them except:FISHMAPHcGH arrayMALDI  <response>: D i.e. MALDISubtelomeric rearrangements of gene eg chromosomal duplications or deletions too small to be detected by conventional cytogentic analysis are detected by c-GH comparative genomic hybridization, multiprobe FISH fluorescence in situ hybridization, MAPH multiplex amplifable probe hybridization and MLPA multiplex ligation-dependent probe amplification. Subtelomeric rearrangements are significant cause of idiopathic familial mental retardation. 