Which one of the following is the highest category Protectee ?

In India, security cover is provided to high-risk individuals based on threat assessments by intelligence agencies. The security hierarchy consists of several levels: X, Y, Y+, Z, Z+, and the Special Protection Group (SPG).

• SPG: This is the highest tier of security in India. Following the SPG (Amendment) Act, 2019, this elite protection is exclusively provided to the Prime Minister of India and their immediate family members residing with them at the official residence.
• Z+: This is the second-highest level, involving a large contingent of personnel (usually around 55), often including NSG commandos.
• Z: A high-security category with about 22 personnel.
• CISF: The Central Industrial Security Force is a paramilitary force that provides security to various protectees, but it is a security agency, not a protection category itself.