a.(4 points) Find the shortest sequence of MIPS machine instructions that will exchange (swap) the contents of registers St5 and St6 without use of any other register (and not creating overflow) swap St5 St6 before St5-value 1 St6 value2 after St5-value2 St6 - alue1 Show the shortest sequence of MIPS machine (not pseudo!) instructions for these C statements b.(6 points)x175+ Assume c corresponds to register St4 and the integer array x begins at memory location 1,048,600 ten- (Hint: How many bits do we need to encode this address value?) C.(4 points) if (ij) goto L Assume that variable i corresponds to register St2 and variable j corresponds to register St4