Develop a class diagram for a Yard class that describes objects serviced by a landscaping maintenance company. Include at least four attributes and three methods. Develop a class diagram for a Message...

Develop a class diagram for a Yard class that describes objects serviced by a landscaping maintenance company. Include at least four attributes and three methods.

Develop a class diagram for a Message class for a cell phone company. Include generalizations for child classes TextMessage, VideoMessage, and VoiceMessage.