What is "DSC" in filing of e-return by legal heir?

Thanks,Vijay,but does it mean that:

1) A LH cannot file a return for the deceased person without obtaining a digital signature?For normal assessees,digital signature is an option but an assessee can choose to not obtain the digital sign and send the ITR-V to CPC,B'lore.

2) If DSC stands for Digital Signature,do we have to pay for it?If so,how much?

3) I guess there must be an option to file the return of a deceased person by a LH by sending the ITR-V to CPC,B'lore like we do for normal assessees.Please clarify.

I request knowledgeable forum members to respond at the earliest.Thanks for your help.

CAN ANYONE PLEASE REPLY-THE MATTER IS URGENT.THANKS.

@ Balaji

Refer below link, it helps you

https://incometaxindiaefiling.gov.in/portal/index.do