Determing student enrollment status for my child for deducting or credits for 1098T expenses

My son was a first year college student last year ( in fall 2024). He was and is 18 and was a full-time college student for 4 months.

In deductions and credits, in the expenses and scholarships section under education, it asks for his enrollment status with options for full-time, at least half-time, or less than half time. What is the requirement to be considered full-time, or half-time?  If you have to be full time in 5 separate months, does high school count?

The goal of course is the get the deduction or credit for 1098T expenses.

I tried searching this and some sources said high school counts toward the 5 months full time requirement and others said it doesn't so I'm not sure but don't want to pass up a significant deduction or credit.

Thank you!