Question: What is the time period that 2453907 is the population of the Texas county whose official website is http://www.dallascounty.org/ (this statement's language is English)?
Options:
2011-07-01
1808
2019-02-13
1529
2012-07-01
1799-01-01
1976
2018-08-16
1921-01-01
1916