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# If denote microwaves , X rays ,infrared ,gamma rays ,ultra - violet , radio waves and visible parts of the electromagnetic spectrum by M ,X,I,G,U,R and V , the following is the arrangement in ascending order of wavelength :

(a) R,M,I,V,U,X and G(b) M,R,V,X,U,G and I(c) G,X,U,V,I,M and R(d) I,M,R,U,V,X and G