Which characters are not permitted in a DNS domain or host name?

Which of the following statements is false?

a. Stream method map maps each element to a new value and produces a new stream with the same number of elements as the original stream. b. A reference is a shorthand notation for a lambda expression. c. ClassName::instanceMethodName represents a method reference for an instance method of a class. Creates a one-parameter lambda that invokes the instance method on the lambda’s argument and returns the method’s result. d. ClassName::new represents a constructor reference. Creates a lambda that invokes the no-argument constructor of the specified class to create and initialize a new object of that class.

Some social media widgets use the HTML __________ element, which enables developers to embed content from another website while preserving formatting and presentation that may look quite different from the surrounding web page.

Fill in the blank(s) with the appropriate word(s).