Which of the following converts milk into curd and increases the amount of vitamin $B_{12}$?

How many of the following statements are correct regarding the process of converting milk into curd?
$I -$ The bacteria responsible for this process are $LAB$.
$II -$ $LAB$ produces acids that coagulate the milk.
$III -$ The protein present in milk is partially digested.
$IV -$ It increases the nutritional quality by increasing the amount of Vitamin $B_{12}$.

During its formation,bread becomes porous due to the release of carbon dioxide by the action of:

Which microorganism is used in the production of bread?

Microorganisms such as $Lactobacillus$ are commonly called:

$A$: After $24 \; \text{hours}$, toddy becomes unpalatable.
$R$: Toddy left for a few hours undergoes fermentation.