Choose the correct form of noun to complete the sentence:
Being dissatisfied with his job, he resigned from his ______.

The noun 'status' means position or rank in relation to others.
The noun 'chair' means the person in charge of a meeting or of an organization.
The noun 'position' means employment for which one has been hired; a job.
The noun 'rank' means a position within the hierarchy of an organization or society.
 
Complete Sentence: Being dissatisfied with his job, he resigned from his position.