셀레늄 웹 드라이버 C #에 옵션을 표시하기 위해 <select> 요소를 클릭하는 방법은 무엇입니까?

<div class="form-control">
<label class="editor-property-label">Operation</label>
<select name="root[Donut][CenterLegend][Operation]">
   <option value="Sum">Sum</option> 
   <option value="Percentage">Percentage</option>
</select>
</div>

세 가지 방법을 시도했지만 모두 실패했습니다.

방법 1 :

IWebElement element= driver.findElement(By.cssSelector("select[name='root[Donut][CenterLegend][Operation]']"));
(IJavaScriptExecutor)driver.ExecuteScript("arguments[0].click()", element);

방법 2 :

IWebElement element= driver.findElement(By.cssSelector("label[class='editor-property-label']"));

(IJavaScriptExecutor)driver.ExecuteScript("document.elementFromPoint(" + element.Location.X +10 + "," + element.Location.Y + 10 + ").click();");

방법 3 :

IWebElement element= driver.findElement(By.cssSelector("select[name='root[Donut][CenterLegend][Operation]']"));

(IJavaScriptExecutor)driver.ExecuteScript("document.elementFromPoint(arguments[0],arguments[1]).click();"element.Location.X ,element.Location.Y);