Question: When did the operating system that has the copyright held by Apple and is known as iOS start?
Choices: 2017-07-12
2012-07-25
2014-04-20
1885-03-04
1983
2008-06-26
1966-09-20
1979-01-29
1918-11-28
2010
SPARQL: SELECT DISTINCT ?qpv WHERE { ?e <pred:instance_of> ?c . ?c <pred:name> "operating system" . ?e <copyright_holder> ?e_1 . ?e_1 <pred:name> "Apple" .  ?e <official_name> ?pv . ?pv <pred:value> "iOS" . [ <pred:fact_h> ?e ; <pred:fact_r> <official_name> ; <pred:fact_t> ?pv ] <start_time> ?qpv .  }
Program:
function: Find
inputs: Apple
function: Relate
dependencies: 0
inputs: copyright holder
backward
function: FilterConcept
dependencies: 1
inputs: operating system
function: QueryAttrQualifier
dependencies: 2
inputs: official name
iOS
start time
Answer: 2010