Answer: Option (1)
Step-by-step explanation:
A shield refers to a stable region within the crust of the earth, which are fored due to the presence of metamorphic rock as well as the crystalline igneous rocks of precambrian age.
The rocks are very old and belongs to the precambrian time. It is the region that is not affected by the tectonic activities and other natural disasters. They remain unaffected by weathering and erosion for a long period of time.
For example, the Canadian shield.
Thus, the correct answer is option (1).