Explore whether the following statements are true or false. Explain why. 1. [3 points] Assume that a relation schema R(A1,,An) is given and that X{A1,,An] holds. For trn, let t[X] be the projection of t to the attributes in X,X is called a key if the following condition is fulfilled: For all relation instances rR of R holds: t1,t2rR:t1[X]=t2[X])t1=t2 2. [3 points] In Relational Algebra, the order of operations does not matter when performing a query