Which of the following statements about Dataiku variables are true? Choose two.

The get$\_$custom$\_$variables$()$ method returns a Python dictionary with the current values of variables.

The set$\_$custom$\_$variables$()$ method allows you to change the value of an individual project variable by specifying the key:value pair of the variable you want to change.

When working with variables, you'll primarily be modifying the instance$-$level variables, in order to impact all projects on the Dataiku DSS instance.

The set of project variables is represented in JSON format in the DSS interface.