"All mobile phones have microphones. Some mobile phones have cameras. All devices with cameras have a battery." Convert these statements into a Venn diagram and use it to answer the following question. If the statements above are true then which of the following statements are incorrect?
a) Sam's mobile phone does not have a camera so it might not have a battery
b) Sam's mobile phone has a camera so it must have a battery
c) Sam has a device that has a camera, a microphone and a battery so it must be a mobile phone
d) Sam has a device that does not have a microphone so it must not be a phone