Answer:
There are different phases of railroad expansion with the innovations in technology.
Explanation:
Few of the technological innovations are described below that leads in railroad expansion more rapid.
1. Centralized Traffic control (CTC) is introduced in 1960's that is used to control the traffic on railroads using different signal control.
2. In 1990's after computer technology involvement, railway ticket and reservation system is automate and being centralized. That makes the railroad expansion improve.
3. Bullet train technology has been introduced, that makes the railway trains more faster.
4. Electric trains has been introduced to use green energy and reduce the dependency on the fuel to make environment clean and green.
<span>d) all of these is your correct answer</span>
The process or activity of writing computer programs.
True, the computer will read from, say, a blu-ray and then transfer it to your RAM to before writing it to your hard drive and then, through the various other wonders of computers, it can be displayed on your monitor.