You need to develop this project with the least amount of development effort

You are developing a SQL Server Integration Services (SSIS) project that contains a project Connection
Manager and multiple packages.
All packages in the project must connect to the same database. The server name for the database must
be set by using a parameter named ParamConnection when any package in the project is executed.
You need to develop this project with the least amount of development effort.
What should you do? (Each answer presents a part of the solution. Choose all that apply.)

A.
Create a package parameter named ConnectionName in each package.

B.
Edit each package Connection Manager. Set the ConnectionName property to
@[$Project::ParamConnection].

C.
Edit the project Connection Manager in Solution Explorer. Set the ConnectionName property to @
[$Project::ParamConnection].

D.
Set the Sensitive property of the parameter to True.

E.
Create a project parameter named ConnectionName.

F.
Set the Required property of the parameter to True.

Explanation:
C: From question: ” The server name for the database must be set by using a parameter named
ParamConnection when any package in the project is executed.”
E: SSIS 2012 has introduced the concept of Project level connection managers. An SSIS project is
generally more than one package. To simplify lives, the SSIS team now allows for the sharing of common
resources across projects, connection managers being one of those resources.
F: When a parameter is marked as required, a server value or execution value must be specified for that
parameter. Otherwise, the corresponding package does not execute. Although the parameter has a
default value at design time, it will never be used once the project is deployed.
Note:
* Integration Services (SSIS) parameters allow you to assign values to properties within packages at the
time of package execution. You can create project parameters at the project level and package
parameters at the package level. Project parameters are used to supply any external input the project
receives to one or more packages in the project. Package parameters allow you to modify package
execution without having to edit and redeploy the package. Integration Services (SSIS) Parameters