Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to distinguish nudism from pornography [title] Recognize and report child pornography. [step] Any images that show a child under the legal age in your country fully unclothed or partially clothed, in a sexual manner or for a sexual purpose, or acting out sexually for any purpose, are called child pornography and are illegal. If you find illegal images of children, whether on the internet or not, you need to contact the police.

Ending1: [substeps] If you have never seen a child in public, you should report the images to the police. The police will issue a warrant to investigate. Ending2: Furthermore, a child under the age of consent could pose a threat. [title] Recognize instances of pornography that involve sexual intercourse. Ending3: [title] Report the images or anyone else you suspect pornography to the police. [step] This is not a requirement for a police report. Ending4: Child pornography is illegal because it is a crime and harms all children. It also distorts people's views on what is acceptable and what isn't.

Answer format: ending1/ending2/ending3/ending4