Option a is the correct answer. Option (i) is correct-Anekantavada is a Jain doctrine about metaphysical truths that emerged in ancient India. It states that the ultimate truth and reality is complex and has multiple aspects. According to Jainism, no single, specific statement can describe the nature of existence and the absolute truth. This knowledge (Kevala Jnana), it adds, is comprehended only by the Arihants. Other beings and their statements about absolute truth are incomplete, and at best a partial truth. All knowledge claims, according to the anekantavada doctrine must be qualified in many ways, including being affirmed and denied. Option (ii) is incorrect- Sarvastivada is a school of thought in early Buddhism that holds that all phenomena exist. It is a form of eternalism, which is the belief that everything exists eternally. Option (iii) is incorrect-Sunyavada is a school of thought in Mahayana Buddhism that holds that all phenomena are empty of inherent existence. It is a form of nihilism, which is the belief that nothing exists. Option (iv) is correct-Syadvada is the dialectical corollary of anekantavada. In short, this doctrine of conditional predication insists that assertions be qualified to better represent the complex nature of reality. By predicating a statement with the particle syat, the relative truth of the claim is expressed. Without such qualification, relatively true claims would be confused with absolutely true claims.