Difference Between Regular Supply Vs Supply Covered under IGST ACT

Earlier in GSTR-1 in B2B Section while uploading the Invoices, anyone in following to be selected for Invoice Type;

1. Regular

2. Supply to SEZ with Payment

3. Supply to SEZ Without Payment

4. Deemed Export

Now Jan-20 onwards, 5th option was added as " Supply covered under Section 7 of IGST Act"

Now my queries are

1. In case of Inter-state supplies what options to be selected whether Regular or Supply covered under Section 7 of IGST Act ?

2. What are supplies to be covered under "Supply covered under Section 7 of IGST Act" apart from Regular ?