What is new in the seventh edition of the book?

The book includes more than 25% of new exercises in each chapter.
The technology features have been improved to provide additional support for conceptual understanding.
The book now includes a section on the surface of the graph of a function of two variables.
The book now includes a project on the historical and physical origins of Green's theorem and Stokes' theorem.
a) Only statements 1 and 2 are correct.
b) Only statements 2 and 3 are correct.
c) Only statements 1, 2, and 4 are correct.
d) All statements are correct.