In the figure provided below,what type of igneous intrusion is the horizontal rock unit shown by letter A? 
Definitions:
Psychologically Healthy
A state of well-being in which an individual realizes their own abilities, can cope with the normal stresses of life, can work productively and fruitfully, and is able to make contributions to their community.
Core Features
Essential attributes or characteristics that define the identity or nature of a concept, object, or phenomenon.
Human Agency
The capacity for human beings to make choices and to impose those choices on the world, influencing outcomes in their lives.
Self-regard
An individual's perception, evaluation, and appreciation of oneself.
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