Treatment of $D$-glucose with aqueous $NaOH$ results in a mixture of monosaccharides,which are

Given below are two statements:
Statement $I:$ Fructose does not contain an aldehydic group but still reduces Tollen's reagent.
Statement $II:$ In the presence of base,fructose undergoes rearrangement to give glucose.
In the light of the above statements,choose the correct answer from the options given below:

$\alpha - D - (+) -$ glucose and $\beta - D - (+) -$ glucose are:

Which of the following is the correct structure of $L$-Glucose?

Sucrose is

What are the anomers of glucose?