Salesforce JavaScript Developer Practice Exam

The output of the code `greetign = {};` is an empty object represented as `{}`. When you execute this line, you are creating a variable named `greetign` and assigning it an empty object. In JavaScript, this is a valid operation, and it does not produce an error.

This empty object can be used to store key-value pairs or functions later, but at this stage, it simply initializes `greetign` as an object with no properties. The notation `{}` is the standard way to define an object in JavaScript, and when logged or printed, it displays as `{}` indicating that it has been created successfully but contains no contents.

The other options, like the ReferenceError, would occur if you tried to access `greetign` without declaring it first, or if there was a typo in the variable name at a point where it's supposed to be recognized. The `undefined` output applies when a variable is declared but not initialized with any value, which is different from creating an object. Lastly, a SyntaxError would be returned if the code broke JavaScript syntax rules, but the line in question follows proper syntax.