Which of the following saccharides is present in milk?

Given below are two statements.
Statement $I$: Maltose has two $\alpha$-$D$-glucose units linked at $C_1$ and $C_4$ and is a reducing sugar.
Statement $II$: Maltose has two monosaccharides: $\alpha$-$D$-glucose and $\beta$-$D$-glucose linked at $C_1$ and $C_6$ and it is a non-reducing sugar.
In the light of the above statements,choose the correct answer from the options given below.

It is best to carry out reactions with sugars in neutral or acid medium and not in alkaline medium. This is because in alkaline medium,sugars undergo one of the following changes:

Identify the correct set of monosaccharides present in sucrose $(X)$,lactose $(Y)$ and maltose $(Z)$.

In the given three structures,two glucose units are linked. Which of the following correctly identifies the linkages between $C_1$ and $C_4$ and between $C_1$ and $C_6$?

On complete hydrolysis of starch,we finally get