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Question $1$

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What happens when a parent QObject is destroyed?

a$.$

Its children are destroyed recursively.

b$.$

The parent and its children are destroyed in parallel.

c$.$

Only the parent is destroyed, and the children remain.

d$.$

The children are moved to another parent automatically.

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Question $2$

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What does the $`$execute$()`$ method of a ConcreteCommand typically do$?$

a$.$

It creates a new instance of Receiver.

b$.$

It directly calls the $`$do$()`$ method of the Receiver.

c$.$

It adds a command to a stack or queue.

d$.$

It initializes a priority system for commands.