About: http://webisa.webdatacommons.org/310024162

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The risk-free interest rates are based on the U.S. Treasury yield curve in effect during the period the options were granted.
http://www.w3.org/ns/prov#wasQuotedFrom	sec.gov