What is the condition of entering sale details in ‘7 - B2C (Others)’ table of GSTR1?

Dear Experts!

The condition of entering sale details in ‘7 - B2C (Others)’ table is that the value of unregistered sales should be less than Rs. 2.5 lakhs. My questions are:

i) Is the value Rs. 2.5 lakhs for a single B2C invoice or total of all B2C invoices?

ii) Value Rs. 2.5 lakhs means Taxable Sales or Invoice Value?

iii) Is any inter-state unregistered sale allowed here to include?