Which of the following statements regarding models in Ruby on Rails is correct?

What is the purpose of the model in an MVC architecture framework such as Ruby on Rails?

For the String class, when using #gsub! what are the potential return values?

Which of the following options will create a many-to-many relation between the 'users' and the 'jobs' tables?

If we need to associate one model with many others, what associations should we use?

Which option will create a new Rails application with default templates?

To establish an association from a Post model to another Post model (say if one post is in response to another and there is a parent_post_id column on the posts table), you would add the following to the Post model:

Output of the following? a = (1 <=> 2) b = (1 <=> 1.0) c = (b <=> a) puts c

Which of the following is a built-in feature of ActiveRecord

We have given: str = 'abcdef' Which of the following will return the string 'def'? 1) str[0,-3] 2) str[-3,3] 3) str[4,3] 4) str['def']

Which of the following are NOT Ruby keywords? 1) alias 2) yield 3) defined? 4) include?