In which scenario would you typically apply the Observer design pattern?*1 pointWhen you need to notify multiple objects of a change in stateWhen you need to create different objects based on a conditionWhen you need to restrict instantiation of a class to one objectWhen you need to manage access to a resource

Which design pattern is used to ensure a class has only one instance and provides a global point of access to that instance? Mark(3 Marks)(Choose one option)ObserverFactory MethodAbstract FactorySingleton

Which design pattern is used to separate abstraction from the implementation?a.Observer Patternb.State Patternc.Noned.Bridge Pattern

What is the benefit of using the Observer pattern?*1 pointIt simplifies the communication logic between objects.It allows for dynamic relationships between objects at runtime.It promotes strong coupling between the subject and the observers.It provides a direct way to update all observers simultaneously.

In ________ design a single test group or area is selected and the dependent variable is measured before the introduction of the treatment. The treatment is then introduced and the dependent variable is measured again after the treatment has been introduced. The effect of the treatment would be equal to the level of the phenomenon after the treatment minus the level of the phenomenon before the treatmentChoose one optionBefore-and-after with control designBefore-and-after without control designAfter-only with control designNone

¿Qué patrón de diseño se utiliza para desacoplar clases concretas de las clases cliente, permitiendo que estas últimas funcionen con múltiples implementaciones?Group of answer choicesPatrón Factory MethodPatrón SingletonPatrón DecoradorPatrón Observer