For a process in which the internal energy does not change (AE = 0), which of the following are possible?
(1) heat > 0, work < 0
(ii) heat > 0, work > 0
(iii) heat < 0, work < 0
(iv) heat < 0, work > 0
a. ili and iv only
b. ll and Iv only
c. i and ii only
d. ii and lii only
e. I and ill only
f. i and iv only