read and choose the correct option.

in chile in the early 1930s, a unified school uniform was made mandatory for all educational institutions, public or private. the uniform consisted of a navy-blue sweater and a white blouse for girls. boys were required to wear grey pants with a white dress shirt and a navy-blue blazer. nowadays, the traditional uniform has been fading from most schools. today, most private and public schools prefer using a customized uniform which proudly shows their school colors and emblems. there are even a few private schools that have eliminated the use of uniforms.

in el salvador, all students are required to wear a uniform, regardless if the school is public or private. uniforms usually vary depending on the school.

in mexico, students from all public schools are required to wear uniforms as well as many private school children. they are not all the same color, and many have a school crest on their sweaters or shirts.

based on the text, which statement is true?

chile, el salvador, and mexico share similar uniform symbols.
the same uniform colors were used in all schools in chile.
it is the principals' decision to use uniforms in schools in chile.
el salvador and mexico followed chile's uniform policy.