Which of the following mode in file opening statement generates an error ifthe file exists?a) a+ b) r+ c) w+ d) None of these

To determine which mode in a file opening statement generates an error if the file exists, we need to analyze the options provided: a) a+, b) r+, c) w+, and d) None of these.

a) The mode "a+" opens the file for both reading and appending. If the file does not exist, it will be created. However, if the file already exists, the data will be appended to the end of the file without generating an error. Therefore, option a) does not generate an error if the file exists.

b) The mode "r+" opens the file for both reading and writing. If the file does not exist, an error will be generated. However, if the file already exists, it will be opened without generating an error. Therefore, option b) does not generate an error if the file exists.

c) The mode "w+" opens the file for both reading and writing. If the file does not exist, it will be created. However, if the file already exists, it will be truncated (emptied) and opened without generating an error. Therefore, option c) does not generate an error if the file exists.

d) The option "None of these" suggests that none of the provided options generate an error if the file exists. However, based on the analysis above, this is not the correct answer.

In conclusion, none of the provided options generate an error if the file exists. Therefore, the correct answer is d) None of these.