The core of Earth is made out of iron and nickel. The outer core’s temperature is so hot that it melts the metal. The inner core is solid metal. What causes these differences? Group of answer choices

The inner core has a cooler temperature, allowing the metal to remain solid.

The inner core is kept solid by the intense pressure of all the layers above it.

The outer core is 2,300 km thick.

The inner core is made of a different metal.
I NEED THE ANSWER IN 5 MIN PLEASE HURRY