What is correct about external emergency as per Article 352?

i. It is proclaimed by the President.

ii. It should be approved by Parliament within two months.

iii. It should be approved by Parliament within one months.

iv. It should be approved by Parliament by simple majority.

v. It should be approved by Parliament by 2/3 majority.

vi. It can be revoked by simple majority of Parliament.

vii. It can be revoked by 2/3 majority of Parliament.

viii. It can be approved in joint session of Parliament.

Chhattisgarh P.C.S. (Pre) - 2017