DRAG DROP
A SQL Server Integration Services (SSIS) project has been deployed to the SSIS catalog.
The project includes a project Connection Manager to connect to the data warehouse.
The SSIS catalog includes two Environments:
Test
Production
Each Environment defines a single Environment Variable named ConnectionString of type
string. The value of each variable consists of the connection string to the test or production
data warehouses.
You need to execute deployed packages by using either of the defined Environments.
Which three actions should you perform in sequence? (To answer, move the appropriate
actions from the list of actions to the answer area and arrange them in the correct order.)
Answer: 
Explanation:
Add the Enivronment reference…
In the deployed project…
Execute the deployed package by…
dbo ‘s answer is right. The project already deployed on sever. So just add Environment, use it and execute with right environment.
Almost fell for it but DBO+Min are right. Project is already deployed. Add, apply and execute.