I am so confused so have few questions regarding responsive layout. Really appreciate if someone will help me to understand this:

1. would like to know if AEM is using bootstrap to implement responsive grid? If yes then which version of bootstrap?

2. Our project is already using bootstrap and media queries to achieve responsive layout so can I use AEM layout container also?

3 difference between bootstrap media queries and AEM layout container?

4. Which approach is better? bootstrap framework or layout containet?