4 .
stock options and other stock plans we have 100962 options outstanding under the 1993 stock option and retention stock plan of union pacific corporation ( 1993 plan ) .
there are 7140 restricted shares outstanding under the 1992 restricted stock plan for non-employee directors of union pacific corporation .
we no longer grant options or awards of retention shares and units under these plans .
in april 2000 , the shareholders approved the union pacific corporation 2000 directors plan ( directors plan ) whereby 1100000 shares of our common stock were reserved for issuance to our non-employee directors .
under the directors plan , each non-employee director , upon his or her initial election to the board of directors , receives a grant of 2000 shares of retention shares or retention stock units .
prior to december 31 , 2007 , each non-employee director received annually an option to purchase at fair value a number of shares of our common stock , not to exceed 10000 shares during any calendar year , determined by dividing 60000 by 1/3 of the fair market value of one share of our common stock on the date of such board of directors meeting , with the resulting quotient rounded up or down to the nearest 50 shares .
as of december 31 , 2009 , 18000 restricted shares were outstanding under the directors plan and 292000 options were outstanding under the directors plan .
the union pacific corporation 2001 stock incentive plan ( 2001 plan ) was approved by the shareholders in april 2001 .
the 2001 plan reserved 24000000 shares of our common stock for issuance to eligible employees of the corporation and its subsidiaries in the form of non-qualified options , incentive stock options , retention shares , stock units , and incentive bonus awards .
non-employee directors were not eligible for awards under the 2001 plan .
as of december 31 , 2009 , 3366230 options were outstanding under the 2001 plan .
we no longer grant any stock options or other stock or unit awards under this plan .
the union pacific corporation 2004 stock incentive plan ( 2004 plan ) was approved by shareholders in april 2004 .
the 2004 plan reserved 42000000 shares of our common stock for issuance , plus any shares subject to awards made under the 2001 plan and the 1993 plan that were outstanding on april 16 , 2004 , and became available for regrant pursuant to the terms of the 2004 plan .
under the 2004 plan , non- qualified options , stock appreciation rights , retention shares , stock units , and incentive bonus awards may be granted to eligible employees of the corporation and its subsidiaries .
non-employee directors are not eligible for awards under the 2004 plan .
as of december 31 , 2009 , 8939710 options and 3778997 retention shares and stock units were outstanding under the 2004 plan .
pursuant to the above plans 33559150 ; 36961123 ; and 38601728 shares of our common stock were authorized and available for grant at december 31 , 2009 , 2008 , and 2007 , respectively .
stock options 2013 we estimate the fair value of our stock option awards using the black-scholes option pricing model .
groups of employees and non-employee directors that have similar historical and expected exercise behavior are considered separately for valuation purposes .
the table below shows the annual weighted-average assumptions used for valuation purposes : weighted-average assumptions 2009 2008 2007 .

<i>Weighted-Average Assumptions</i>
2009
2008
2007
Risk-free interest rate
1.9%
2.8%
4.9%
Dividend yield
2.3%
1.4%
1.4%
Expected life (years)
5.1
5.3
4.7
Volatility
31.3%
22.2%
20.9%
Weighted-average grant-date fair value of options granted
$11.33
$13.35
$11.19

.

Question: Analyse this data from a financial earnings document. how many options were issued under the 2001 plan as of december 31 , 2009?
Choices:
206337.7
23999996
20633770.0
23999820
24000000
Correct choice index: 2