The function `f:NtoN,N` being the set of of natural numbers, defined by f(x)=2x+3 is

The function f: N rarr N ( N is the set of natural numbers) defined by f(n)=2n+3 is

The function f:N rarr N(N is the set of natural numbers) defined by f(n)=2n+3is (a) surjective only (b) injective only (c) bijective (d) none of these

The function f : N rarr N , Where N is the set of natural numbers, defined by f(x) = 3x+4 is

f: N to A where N is the set of natural numbers and A is the set of even natural numbers, defined by f(x) = 2x , then f is: