Explanation:

- Option 1: Void

- Agreements that restrict the freedom of a person may be void. The law often invalidates such contracts because they limit personal liberty without justification.

- Option 2: Against Public Policy

- Contracts that restrict personal freedom can be considered against public policy. Society values individual rights and agreements infringing them might conflict with societal norms.

- Option 3: Both (a) and (b)

- Agreements that limit personal freedom can be both void and against public policy. The law seeks to balance contract freedom and individual rights.

- Option 4: Neither (a) nor (b)

- This is incorrect because restrictive agreements often clash with personal liberty principles.