Which function is used to read a file in Python?

The use of the open() function followed by read() is the correct approach to read a file in Python. The open() function is a built-in Python function that is used to open a file and returns a file object, which can then be manipulated with various methods. After opening the file, the read() method can be invoked on the file object to read the contents of the file into a string.

This method allows for versatile file operations, including reading the entire content at once or using other methods such as readlines() to read the file line by line. It is essential to ensure that the file is properly closed after operations are completed, often managed by using a with statement to handle file context automatically.

Other options provided do not represent valid Python syntax or functions for reading a file. For instance, readFile() and readFileSync() are not standard Python functions, and file.open() does not exist as a standalone function in Python. Thus, the combination of open() and read() is clearly aligned with Python's file handling practices.