Explanation:

- Option 1: Reference and background checking

- This step involves verifying the candidate's past employment, educational qualifications, and any other necessary background details.

- Option 2: Selection decision

- Here, the employer decides if the candidate is the right fit for the role based on the tests and interviews conducted.

- Option 3: Job offer

- This involves offering the candidate a position in the company, usually including details about the role, salary, and other benefits.

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- Option 4: Contract of employment

- This is the formal agreement signed by both parties, detailing terms and conditions of employment, such as duties, salary, and start date.

The scenario described matches Option 3, where Aruna received an offer containing employment terms and joining date.