Final answer:
The correct number of columns in a VisiCalc spreadsheet is 63, using the letters A through Z, then AA through ZZ, but excluding IZ. This was the standard for the first spreadsheet software for personal computers.
Step-by-step explanation:
The question asks about the number of columns in a VisiCalc spreadsheet, which is a historical piece of software known as the first spreadsheet program for personal computers. VisiCalc spreadsheets are organized into rows and columns, with each cell in the grid identified by a combination of a letter for the column and a number for the row. The correct number of columns in a VisiCalc spreadsheet is 63, which corresponds to the letters A through Z followed by AA through ZZ, excluding the combination IZ, as the program used uppercase letters only and had a unique way of representing columns after Z.