Q$3$: Nested Query$(5$ pt$)$: Given the same relational schema above. You should only use nested query:

NationalPark$($pid$,$ name, state, year,rating, entry$\_$fee$)$

BelongTo$($pid$,$ tid ${?}_{(}),$ loc$)$

Hiking$($t$.$tid, name, length, rating$)$

LocIn$(d_{,}ci{d}_{,}$loc$)$

Campsite$($cid$,$ name, fee, rating$)$

Answer the nested SQL query for the following questions:

$($a$)$ Juan plans to visit all national parks in Texas, he plans to only visit the parks that have a trail with a rating greater than $4,$ and ALL the campsites are cheap enough $($less than $$10$ per night$)$ so that he can afford them. Could you help him figure it out $($You should return a table that consists of park name: $($name$))$

$($b$)$ Jose also plans to visit national parks after this semester. He is Juan's best friend. He plans to visit the national parks where ALL the trails have a rating greater than $3.$ Juan and Jose plan to meet at some national parks to hike a trail together. Is it even possible? Please write an SQL query that can verify your answer and explain it$.$