1. 9.31 In a replacement study conducted last year, it was determined that the defender should be kept for 3 more years. In reviewing the current costs, it appears that the estimates for this year and next are still valid. The proper course of action is to: 1. Replace the existing asset now. 2. Replace the existing asset 2 years from now, as was determined last year. 3. Conduct a new replacement study using the new estimates. 4. Conduct a new replacement study using last year’s estimates