Answer:
It is not valid
Explanation:
I'll assume the question relates to cell referencing in Microsoft Excel.
To reference a cell in Excel, we make use of the following steps:
- Write out the cell column name first
- Followed by the row number
7b implies that, the row number first, followed by the column name; this doesn't follow the naming convention of cells.
Hence, 7b is invalid.
Answer:
- RFID tags in shopping mall.
- Browsing the internet.
- Mobile phone calls
Explanation:
Radio frequency identification tag (RFID) in a device that holds personal information of a user electromagnetically. it is used in shopping mall, installed in the shopper's phone or a card, in which all payments are done automatically.
The internet is a global network of devices. With a subscription to a internet service provider, a user can surf the internet at any time of the day.
Mobile phones are portable devices, procured by a user for on-the-go calls. This cell phones have databases with information of cell tower connections, for easy switching for flexible but quality call adaptation.
It could be an issue with your email. Have you tried changing your passeord?
B lol its the only one that makes since all though im not sure if im exactly right
