All windows are doors. No door is wall

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In question below is given a statement followed by two conclusions numbered I and II. You have to assume everything in the statement to be true, then consider the two conclusions together and decide which of them logically follows beyond a reasonable doubt from the information given in the statement.

All windows are doors. No door is wall

Conclusions:

          1.No window is wall

          2. No Wall is door

A. Only assumption I is implicit
B. Only assumption II is implicit
C. Either I or II is implicit
D. Neither I nor II is implicit

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