12.1. For each of the following domains, determine whether it is simply connected, multiply connected, or neither (not connected): (a). A = {2:0< |2z-1|<3}, (b). B = {2: Argz #0}, (c). C= {z: z-i>1, 2-3 > 3 and 2 <10}, (d). D= {z: Im z # 0}, (e). E = {2:12 <1 and Rez <0}, (f). F= C-{x+iy: 0≤x≤3}.

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