Which of the following is a characteristic of Social Security Disability Insurance (SSDI)?

Social Security Disability Insurance (SSDI) is specifically designed to provide financial assistance to individuals who are unable to work due to qualifying disabilities. The primary characteristic of this program is that it offers benefits to those who have worked and paid into the Social Security system and meet certain eligibility criteria. This support is crucial for disabled individuals, as it helps them maintain a minimum level of income when they are unable to earn a living because of their disabilities.

The other choices do not accurately describe SSDI. It does not cover all health services related to disability, nor is it aimed at helping anyone with low income, as eligibility is tied to work history and contributions. Additionally, SSDI does include coverage for disability insurance, as this is fundamental to its purpose of providing financial relief to those with severe disabilities.