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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def is_link(path):
    '''
    Check if the path is a symlink

    This is only supported on Windows Vista or later.

    Inline with Unix behavior, this function will raise an error if the path
    is not a symlink, however, the error raised will be a SaltInvocationError,
    not an OSError.

    Args:
        path (str): The path to a file or directory

    Returns:
        bool: True if path is a symlink, otherwise False

    CLI Example:

    .. code-block:: bash

       salt '*' file.is_link /path/to/link
    '''
    if sys.getwindowsversion().major < 6:
        raise SaltInvocationError('Symlinks are only supported on Windows Vista or later.')

    try:
        return salt.utils.path.islink(path)
    except Exception as exc:
        raise CommandExecutionError(exc)