You have an online electronics business and you‟ve set up an ad group for digital cameras. What keywords could make this ad group as effective as possible?

You have an online electronics business and you‟ve set up an ad group for digital cameras. What keywords could make this ad group as effective as possible?

A) Words from headlines on your website like “electronics” and “sale on cameras”
B) Brand names of your top competitors cameras
C) Words in your ad text, like model names of digital cameras
D) General phrases related to photography like “camera lens” and “camera base”