Select which of the following is a DTD definition that best fulfills the following conditions.

Information for a multiple number of products coded within in one XML document. Character data can be coded for product names $($element name: product$).$ The product number must have a single, unique name $($attribute name: partsno$),$ and is verified as singular and unique by the XML parser. Characters such as # and @ must not be used in price information $($attribute name: price$)$ The default value for price $($attribute name: price$)$ is "open". The "product" element must have a defined "partsno" attribute.

Select one:

A$.$

ELEMENT product $($#PCDATA$)>$

B$.$

$>$

C$.$

ELEMENT pdata $($product$)*>$

${?}^{(**)}>$

$<mi\; id="EditorElement\_106">|</mi>$ATTLIST product partsno ID $=$REQUIRED $>$

s:ATTLIST product price NMTOKEN "open"s