1 VGA - VGA is an analog output, and was most common in the CRT-era of computer displays. It has largely been phased out of any recent hardware, but you may encounter it with older computers or CRT monitors.  DisplayPort - This is a digital connection, similar to HDMI.
There is evidence that iron was known from before 5000 BCE. The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in about 4000 BCE. The discovery of smelting around 3000 BCE led to the start of the iron age around 1200 BCE and the prominent use of iron for tools and weapons.
The beginning of Iron Age varies as per the regions and it is evident that every region that experienced this time period had actually had it in an exclusive time period which was different from every other region in this case. In China, Iron Age began around 600 B.C. In ancient periods of Korea and Japan, the Iron Age is considered to begin during 500 to 400 B.C. As per the Britannica Encyclopedia, iron was used under limitations in the ancient Middle East during 3000 B.C. It claims that metal was much more dominant in that region at that particular time.