Shirley (53) uses the head of household filing status and claims her grandson Thad (4) as a qualifying child for the Child Tax Credit (CTC). Her 2020 AGI was $75,000 and her 2021 AGI is $150,000. Which statement is correct about Shirley's 2021 CTC?

Shirley is not permitted to receive any advance payments of CTC. She will be eligible to claim $3,600 on her 2021 return.

If Shirley receives excess advance payments of CTC, she will be required to repay the entire excess amount

Shirley's total 2021 CTC for Thad will be $2,000 and she will be eligible to receive $1,400 in advance payments.

On her 2021 return, Shirley will be eligible for $3,600 CTC, but only 50% will be a refundable credit