C$.$ Short Answer $1.(5$ points$)$ Describe the meaning of $3-$DCE$.2.(5$ points$)$ What is a block chain and what does it do$?53.(5$ points$)$ Give a reason why most managers use Type $2$ service level $($instead of Type $1$ service level$)$ to describe the service level achieved in their organizations. $4.(5$ points$)$ Describe the SCM strategy that Anheuser$-$Bush adopted in $1990$s based on types of beer produced.