Which of the following defines a row in a spreadsheet?

A row in a spreadsheet is defined as a horizontal series of cells. Each row is identified by a number, and it spans across the columns of the spreadsheet. This organization allows you to structure data in a way that makes it easy to read and analyze, as each row can potentially represent a single record or data entry.

In contrast, a vertical series of cells pertains to columns, which are arranged from top to bottom and indicated by letters. A cell that contains a formula is a specific type of cell within a row or a column that performs calculations based on the data in other cells. A worksheet tab refers to the individual sheets within a spreadsheet file, which helps organize different sets of data, but it does not define a row on its own. Thus, describing a row as a horizontal series of cells accurately captures its function and layout within a spreadsheet.