Fully Insured vs Currently Insured

Which of the following clients would be considered fully insured under Social Security rules?
- Maria, age 45, who has earned 10 quarters of coverage in the past 10 years.
- James, age 62, who has earned 40 quarters of coverage over his lifetime.
- Angela, age 28, who has earned 6 quarters of coverage in the past 13 quarters.
- Robert, age 55, who has earned 20 quarters of coverage total, but only 5 in the last 10 years.