Which Statement is true regarding claiming the Residential Energy Efficient Property Credit?

1) Taxpayer may claim a 30% for the costs of qualified solar electric property

2) Labor costs are not included for the credit

3) The unused portion of the credit cannot be carried forward to the next tax year

4) Taxpayers may claim a 10% credit for the costs of qualified solar electric property

CAN YOU PLEASE GIVE ME THE RIGHT ANSWER? tHANK YOU