Which statement is true about forums? forums are considered modern-day journals where users can publish reviews. users are not required to sign up in order to post content on a forum. it is not necessary to sign up and create a profile on a forum to take part in discussions and create posts. each forum revolves around a particular topic and has its own culture and rules.

Pp 4.1 design and implement a class called sphere that contains instance data that represents the sphere’s diameter. define the sphere constructor to accept and initialize the diameter and include getter and setter methods for the diameter. include methods that calculate and return the volume and surface area of the sphere (see pp 3.5 for the formulas). include a tostring method that returns a one-line description of the sphere. create a driver class called multisphere, whose main method instantiates and updates several sphere objects.