If a method is protected:

All Ruby number objects are instances of class _____.

Which is valid objects of class Integer or one of its subclasses? 1) -123 2) 0xFF 3) 123_456_789 4) 123456789123456789123456789123456789

What's an equivalent way of performing the following (h is a Hash): h.each { |k,v| h.delete k if k.nil? }

In The Author Model, how do you create a nested association between Authors and Blogs?

Which is not a valid callback?

Which of these files determine Ruby version and gemset for RVM library?

Which statement is true regarding the find_or_create method in Ruby on Rails?

Which of the following protects 'NOT NULL' fields against missing a user input?

Which is not an advantage of using an integrated development environment (IDE) for Rails ,compared with using a simple text editor?

How can the Heroku deprecation warning be removed from a Rails plugin that has been used?