Given figure is of filamentous. Blue green alga Nostoc. Identify the parts marked as A and B and select the correct option.

Options

A. `{:(,A,B),((a),"Heterocyst","Mucilaginous sheath"):}`
B. `{:(,A,B),((b),"Vegetative cell","Mucilaginous sheath"):}`
C. `{:(,A,B),((c),"Trichomes","Cell wall"):}`
D. `{:(,A,B),((d),"Muclilaginous sheath","Heterocyst"):}`

Answer

A