Assume StringBuffer strBufis "Petra University, after invoking "Petra City University strBuf contains + Question 9 Not yet answered Marked out of 100 Flag question 1 7 Select one: O a.strBuf.insert(6, "City "); O b. strBuf insert(5, "City "); O c. str Buf append(6, "City "); od strBuf insert("City": 13 19 25 Question 10 Finish attempt An attribute that is shared by all objects of the class is coded using Not yet answered Time left 0:51:41 Marked out of 100 has question Select one: O a an instance variable O b. a static variable O can instance method da static method