Which is true about cookies?

A、Cookiesaresmalltextfilesputonthewebserverwhenwebsitedataissenttotheuser
B、Cookiesaretheonlymeanstotrackandprofilewebsiteusers
C、Third-partycookiesaresentbythewebsiteoperatortotheuser’sdevice
D、First-partycookiesallowthewebsiteoperatortotailorhisownwebsite