Which of the following allows you to save a single attr…

Which of the following allows you to save a single attribute value on an EAV entity?

A.
$model->saveAttribute($attributeCode);

B.
$model->save ($attributeCode);

C.
$model->getResource ( ) ->saveAttribute ($model, $attributeCode);

D.
$model->getResource ( ) ->save($model, $attributeCode);