Food related standards in India split into those that are compulsory, like FSSAI registration, and those a manufacturer chooses to adopt to signal higher quality. AGMARK certifies the quality of agricultural produce, and BIS, through its ISI mark, certifies a wide range of processed food products, and for most product categories neither certification is legally forced on the manufacturer. Since both are chosen voluntarily to build consumer trust rather than mandated for every product, the correct answer combines AGMARK and BIS.