Which tool allows you to create custom shapes and paths using Bézier curves?

The Pen Tool is specifically designed for creating custom shapes and paths using Bézier curves, making it a powerful tool in Adobe Illustrator for precise and intricate design work. By placing anchor points and manipulating the direction handles, users can create smooth curves and sharp angles, effectively sculpting any shape needed for their design. This ability to control the shape with precision allows for detailed artwork, logos, and intricate illustrations.

In contrast, the other tools serve different purposes: the Rectangle Tool is limited to rectangular shapes, the Shape Builder Tool is utilized for combining and modifying existing shapes rather than creating new ones from scratch, and the Pencil Tool is primarily used for freehand drawing and does not offer the same level of control over curves and paths as the Pen Tool. This distinction underscores why the Pen Tool is the correct choice for creating custom shapes and paths with Bézier curves.