Under Section 20 of the Unlawful Activities (Prevention) Act (UAPA), 1967, an individual convicted of being a member of a terrorist organization can face imprisonment for a term that may extend to life imprisonment, along with a possible fine. The UAPA targets unlawful activities and terrorism, and membership in a banned terrorist organization is treated as a serious offense. The other options (5, 7, or 10 years) do not reflect the maximum punishment under this section, as the law allows for the severest penalty to deter terrorism-related activities.