National Security is a 2003 action comedy film, directed by Dennis Dugan, starring Martin Lawrence and Steve Zahn. In addition to Lawrence and Zahn, "National Security" boasts an additional cast of Bill Duke, Eric Roberts, Colm Feore, Matt McCoy, and others.
National Security has Martin Lawrence as the main actor.
A: Yes

Demi Lovato: Live in Concert (also known as the Summer Tour 2009) was the debut headlining concert tour by American singer Demi Lovato, launched in support of her debut album "Don't Forget" (2008) and the second studio album "Here We Go Again" (2009).
In 2008 Demi Lovato had more studio than live performance experience
A: Yes

The Stanchester Hoard is a hoard of 1,166 Roman coins dating from the fourth to early fifth century found at Wilcot, in the Vale of Pewsey, Wiltshire, England in 2000. The find was considered important because of the large quantity of unclipped silver coins contained within. It was also the latest dated example of Roman coins found in Wiltshire.
The Stanchester Hoard contains both gold and silver coins
A:
It's impossible to say