A disability income policy uses an 'own-occupation' definition of total disability. This means the insured is considered totally disabled if, because of injury or sickness, they cannot:

Explanation

An own-occupation definition treats the insured as totally disabled when they cannot perform the important duties of their own regular occupation, even if they could work in some other job; it is the more generous (and thus more expensive) definition, favoring the insured. The 'any-occupation' definition, which is stricter, requires that the insured be unable to work in any job for which they are reasonably suited by education, training, or experience, and that is what the first and fourth options describe. Being unable to leave home is not part of either standard definition.