What is bond?

A、Bondisthecertificateofcreditor'srightsanddebt,whichisissuedbyaborrowertoabondinvestor.;
B、Bondisthecertificateofcreditor'srightsanddebt,whichisissuedbyaborrowertoabondinvestorandpromisesinanagreedmannertorepaytheprincipal.;
C、Bondisthecertificateofcreditor'srightsanddebt,whichisissuedbyaborrowertoabondinvestorandpromisesatacertaininterestratetopayinterestandinanagreedmannertorepaytheprincipal.;
D、Bondisthecertificateofcreditor'srightsanddebt,whichisissuedbyaborrowertoabondinvestorandpromisesatacertaininterestratetopayinterest.