Craig Is Working to Develop an XSLT Application to Display

Craig is working to develop an XSLT application to display election results, using XML files with the structures shown in the accompanying figure. He has heard that you have experience developing applications, and comes to you for guidance.
-Now that the candidatesDoc variable has been created, Craig would like to define a key named cKey based on the values of the candidateID attribute for the candidate. Which of the following do you tell him shows the correct syntax to use to define this key?

A) <xsl:key name="cKey" match="candidate" use="@candidateID" />
B) <xsl:key name="cKey" match="candidate" select="@candidateID" />
C) <xsl:key name="cKey" match="candidate" use="candidateID" />
D) <xsl:key name="cKey" match="candidate" select="candidateID" />