Which of the following are absent in snakes?

Given below are two statements:
Statement $I$: The class name Reptilia refers to creeping or crawling mode of locomotion.
Statement $II$: All organisms belonging to Reptilia have three chambered heart.
In the light of the above statements, choose the most appropriate answer from the options given below:

The largest venomous snake is .....

Which one of the following is a limbless lizard?

Zoological name of common Indian krait is

The snake having head shields and elongated hexagonal vertebrals is: