science - GS questions based on daily current affairs

1)   Consider the following statements regarding silicene.

1. Researchers have created the first transistors out of silicene, the world's thinnest silicon material.
2. It will lead to development of faster and more efficient computers and other electronics.
3. The major breakthrough here is the efficient low-temperature manufacturing and fabrication of silicene devices for the first time.
4. Silicene is world's thinnest silicon material. Researchers used it to create One-atom-thin silicon transistors.

Which of the above statement is true?

a. 2,3,4
b. 1,2,3
c. 1,3,4
d. All the above