Theft incidents in a residential area of a city before 2008 often occurred. In 2008, at the request of the residents, the property management department installed a technologically advanced multifunctional anti-theft system for the community. It shows that the multifunctional anti-theft system plays an important role in preventing the occurrence of theft time. Which of the following is true to best strengthen the above conclusion? ['Thefts in other communities in the city have increased significantly since 2008.', 'Another multi-functional anti-theft system is also installed in another residential area of the city, but the effect is not good.', 'Since 2008, the city has strengthened public security management and the number of thefts has decreased.', 'Taking other anti-theft measures can also have a certain effect on preventing theft.']