Answer:
.xlxs
but it supports pretty much any spreadsheet format.
 
        
             
        
        
        
Answer:
Explanation:
A relational database is designed to enforce the uniqueness of primary keys by allowing only one row with a given primary key value in a table. A foreign key is a column or a set of columns in a table whose values correspond to the values of the primary key in another table.
 
        
             
        
        
        
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Known as the 'software development life cycle,' these six steps include planning, analysis, design, development & implementation, testing & deployment and maintenance. Let's study each of these steps to know how the perfect software is developed.
        
             
        
        
        
Answer:
The answer to this question is given below in the explanation section. 
Explanation
Carly is part of a community of developers. In her free time, she works on code to improve this open-source operating system. The OS she's working on is most likely are:
- Linux
- OpenBSD
- FreeBSD
- NetBSD
- AROS
- Tock
- FreeDOS
- Dragonfly BSD
- Qubes OS
- Haiku
- Redox
- ReactOS
- Subgraph OS
- osv.io
- ToaruOS
- Mezzano
- House
- Minoca OS
- SOS
- PowerNex
- Interim OS
- KolibriOS
- MINIX
- HelenOS
- Sculpt
- Harvey
- illumos
- GeckOS/A65 V2.0
- Serenity
- GNU Hurd
- Plan 9
- AquilaOS
- Biscuit
- Xv6
These are the different opensource operating systems.