Which of these statements best compares p waves and s waves of an earthquake?
a. both s waves and p waves travel through oxygen gas.
b. both s waves and p waves travel through carbon dioxide gas.
c. s waves do not tavel through molten rocks but p waves travel through molten rocks.
d. p waves do not tavel through molten rocks but s waves travel through molten rocks.

The following function returns a string of length n whose characters are all 'x'. give the order of growth (as a function of n) of the running time. recall that concatenating two strings in java takes time proportional to the sum of their lengths. public static string f(int n) { if (n == 0) return ""; if (n == 1) return "x"; return f(n/2) + f(n - n/2); } options: a) constant b) logarithmic c) linear d) linearithmic e)quadratic f)cubic g) exponential