Answer:On the Home tab, in the Views group, click View, and then click Design View. In the table design grid, select the field or fields that you want to use as the primary key. To select one field, click the row selector for the field that you want.
Explanation:
I believe it is C, I'm so sorry if im incorrect.
We have that the .xlsm <em>Format </em>is used to save Excel Macro-Enabled Workbook file
<h3>Formats</h3>
Generally file are saved in different formats for easy sorting and application on the operating system.
For instance if a music file is renamed and stored in a different format say .exe the audio file wont be recognised as an audio file and hence refuse to play.
e.g
- .exe for a windows appication
- ,mp3 for an audio file
- .xlsm here is used to save Excel Macro-Enabled Workbook file
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Just multiply all numbers to get the total number of bits:
25*50*12 = 15000 bits.