Answer: Operate over existing telephone lines to carry voice, data, and video.
Explanation:
Digital subscriber line is a means of transferring high bandwidth data over a telephone line. Such data could be a voice call, graphics or video conferencing. DSL uses a user's existing land lines in a subscriber's home, allowing users to talk on a telephone line while also being connected to the Internet. In most cases, the DSL speed is a function of the distance between a user and a central station. The closer the station, the better its connectivity. 
 
        
             
        
        
        
This type of freedom is called dreaming
        
             
        
        
        
the answer should be the letter a 
 
        
                    
             
        
        
        
Answer:
True
Explanation:
Using CCleaner, it's revealed that there are trackers within "secure" websites/apps such as Google and Tiktok. The manufacturer(s) of these websites/apps can share your information with whoever they're working with. Since people often look past the terms and conditions when installing an app and or program, they don't see that companies can easily retrieve all of your data within a couple clicks. 
 
        
             
        
        
        
<h2>Upgrading and retraining are mandatory to move along with the world.</h2>
Explanation:
Let us understand the term deeply,
Upgrading - Updating yourself with the latest
Retraining - learning new skills
Let me give you a real-life example which is nothing but "mobiles". If you are not updated then:
- you will sit with mobile to make calls and 
- do money transactions only by stepping into the bank, 
- connect with people only through calls or directly visiting them, 
- distance break up the relationship, 
- booking tickets in classical way, etc. 
These could be done in one touch if you have latest mobile with necessary applications.
In a similar way, we need to get retrained to get to learn new skills, technologies so that we can do our job the best, to be on track, be productive, convert your valuable knowledge in terms of money, to be peaceful in day today transactions, etc.