Based upon your output, answer the following questions:

In which years is GPS$$s pension plan underfunded during the period $2012-2021?$

In which years is Tru, Incorporated$$s pension plan underfunded during the period $2012-2021?$

In which year did the two companies begin reporting the service cost and non$-$service cost components of the net pension cost separately in their income statements?

What are the $($a$)$ service cost and $($b$)$ non$-$service cost components of the net pension cost for GPS in $2021?$