老师，请问第4行

问题如下：

Steele begins building a model that combines the structured financial data and the sentiment data. She starts with cleansing and wrangling the raw structured financial data. Exhibit 1 presents a small sample of the raw dataset before cleansing: Each row represents data for a particular firm.

Exhibit 1 Sample of Raw Structured Data Before Cleansing

What type of error appears to be present in the IPO Date column of Exhibit 1?

选项：

A.

invalidity error.

B.

inconsistency error.

C.

non-uniformity error.

解释：

C is correct. A non-uniformity error occurs when the data are not presented in an identical format. The data in the “IPO Date” column represent the IPO date of each firm. While all rows are populated with valid dates in the IPO Date column, the dates are presented in different formats (e.g., mm/dd/yyyy, dd/mm/yyyy).