What is the purpose and importance of conversations between constant price (CP) dollars and Then-Year (TY) dollars? A) Converting CP Dollars to TY dollars allows the CP to be used as a constant dollar refence point to tract program growth; B) CP dollar are derived by dividing Then Year estimate by appropriated annual inflation indices; C) Converting TY dollars to CP dollars eliminates the distortion that would otherwise be caused by inflation charges in order to yield a credible estimate; D) Converting CP dollars to TY dollars produces viable inputs for the planning, programming, Budgeting, and execution (PPBE) process.