Arrange the following layers of microsporangium according to their presence from inside to outside.
(A) Endothecium
(B) Middle layer
(C) Tapetum
(D) Epidermis
Option 1 : A, B, C, D
Option 2 : B, A, C, D
Option 3 : D, C, B, A
Option 4 : C, B, A, D
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