What Is the Purpose of International Investment Agreements (IIAs)

What is the purpose of international investment agreements (IIAs)

A) IIAs are signed between countries and aim to provide investment assurance and protection for foreign firms.
B) IIAs are signed between a country and an MNE. They are unilateral assurances from the country to the MNE.
C) IIAs are signed between a country and an MNE. They are unilateral assurances by the MNE that it will adhere to all local laws.
D) IIAs are a different name for an agreement to invest in another country.