A hypothetical $1,000 par 20-year bond is used on January 21, 2013 at a price of 98.515. The issuer can call the bond in whole or in part every January 21, from 2019. Call prices at different call dates are listed below: Year 2019 2020 2021 2022 2023 2024 2025 2026 and thereafter Call Price ($) 102.000 101.655 101.371 101.095 100.824 100.548 100.273 100.000 1. What is the length of the call protection period? 2. What is the call premium (per bond) for the 2022 call date? 3. What type of exercise style does this callable bond illustrate