The rectangles are called as . . . . . . . . symbols in the flowchart.

Decision
Process
Input/Output
Start/End

The correct answer is: B. Process

A process symbol is a rectangular shape with rounded corners. It represents a step in a process that transforms data or information.

A decision symbol is a diamond-shaped symbol. It represents a point in the process where a decision must be made.

An input/output symbol is a parallelogram-shaped symbol. It represents an input or output of data or information.

A start/end symbol is a circle-shaped symbol. It represents the beginning or end of a process.

Here is a diagram of a flowchart with the different symbols labeled:

The process symbol is the most common symbol in a flowchart. It is used to represent any step in a process that transforms data or information. The process symbol can be used to represent a simple step, such as adding two numbers together, or a complex step, such as a series of calculations.

The decision symbol is used to represent a point in the process where a decision must be made. The decision symbol has two or more branches, each of which represents a possible outcome of the decision. The branch that is followed depends on the outcome of the decision.

The input/output symbol is used to represent an input or output of data or information. The input/output symbol can be used to represent a simple input, such as a user entering a value, or a complex input, such as a file being read from the hard drive. The input/output symbol can also be used to represent a simple output, such as a user seeing a message on the screen, or a complex output, such as a file being written to the hard drive.

The start/end symbol is used to represent the beginning or end of a process. The start/end symbol is a circle with a line coming out of it. The line coming out of the start/end symbol represents the flow of data or information into or out of the process.

I hope this helps!